CORE PRO Duffel Large 51L

4.8
Rated 4.8 out of 5 stars
4.8 Stars (1,173 Reviews)
$240
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THE NEXT EVOLUTION OF OUR BEST-SELLING GYM DUFFEL

OUR BEST SELLERS, BUILT TOUGHER

Built for serious training and serious organization, the CORE PRO Large Duffel gives you maximum room for your gym setup.

Purpose built for weightlifters. Carry your belt without sacrificing bag space. The dedicated external sleeve keeps it housed securely, while magnetic webbing straps snap into place to lock it down. The CORE PRO Large Duffel features a large velcro patch panel for personalization, dual drink bottle holders, secure quick-access pockets and our most heavy-duty shoulder strap to date.

KEY FEATURES:

  • Dimensions: 32cm H x 50.8cm W x 32cm D / 12.6" H x 20" W x 12.6" D
  • Fits up to size 13 shoes
  • Designed to fit training essentials - shoes, clothes, accessories, wraps, straps, towel, water bottle, lifting gear and more
  • Dedicated lifting belt sleeve 
  • 16" Laptop sleeve
  • Velcro panel for patch personalization

Add optional dividers and a lifting belt to build your setup your way.*

*Dividers and lifting belt sold separately.

Covered by our guarantee to be free of defects in material or workmanship. If there is a defect in materials or workmanship KNKG will repair or replace your bag.

Our bags are meticulously designed to stand up to the test of time. We utilize durable materials, coupled with top-notch craftsmanship and rigorous testing, resulting in the toughest bags in the game. You can confidently pack your bag to its maximum capacity without worrying about it stretching or tearing.

The CORE PRO Duffel is made from:

• 500D nylon body material (PVC backing).
• Magnetic snap closure on belt sleeve.
• Heavy duty YKK zippers.
• Powder-coated steel buckles and hardware.
• Ripstop nylon internal lining.
• Reinforced nylon webbing straps and handles.
• Velcro patch attachment panel.

CORE PRO Duffel dedicated lifting belt sleeve
BUILT-IN BELT STORAGE

THE CORE DIFFERENCE

Your lifting belt has its own place.

The CORE PRO Duffel is built with a dedicated external lifting belt sleeve, so your belt stays secure, accessible and out of the main compartment.

01

Carry it hands-free

No more carrying your belt separately or forcing it inside your bag.

02

Save internal space

Keep more room inside for shoes, clothes, towels, bottles and daily gym gear.

03

Locked in place

Magnetic snaps secure the belt sleeve faster, cleaner and more securely.

CORE PRO — NEXT EVOLUTION

Upgraded where it counts

Same proven CORE function. Now upgraded with smarter belt storage and more ways to make it yours.

CORE PRO magnetic belt sleeve detail
01

Magnetic Belt Sleeve

Upgraded from velcro to magnetic snaps for faster, cleaner and more secure belt storage.

CORE PRO large velcro patch panel
02

Large Velcro Patch Panel

Built for added customization. Attach your favourite patches and make your CORE PRO setup your own.

CORE PRO heavy-duty shoulder strap
03

Heavy-Duty Shoulder Strap

Our most heavy-duty shoulder strap to date, made with a stronger build, padded support and a more secure carry feel.

CORE PRO custom hardware and reinforced webbing
04

Custom Hardware & Reinforced Webbing

Finished with custom hardware and double-reinforced webbing in high-stress areas for a tougher, more dependable build.

CORE DUFFEL
SIZE COMPARISON
Capacity
Bag Weight
Height (H)
Width (W)
Depth (D)
Shoe Storage
Laptop Sleeve
Lifting Belt Size
MINI
15 L / 4 GAL
1.2 kg / 2.6 lbs
23cm / 9.1"
38cm / 15"
18cm / 7.1"
Not recommended
iPad
KNKG Belt
SMALL
25 L / 6.6 GAL
1.4 kg / 3.1 lbs
25cm / 9.8"
40cm / 15.7"
25cm / 9.8"
Size 10
Up to 14"
4.5" (W) - 45" (L)
MEDIUM
35 L / 9.2 GAL
1.6 kg / 3.5 lbs
28cm / 11"
45cm / 17.7"
28cm / 11"
Size 10
Up to 16"
6.3" (W) - 45.7" (L)
LARGE
51 L / 13.4 GAL
1.8 kg / 4.0 lbs
32cm / 12.6"
50.8cm / 20"
32cm / 12.6"
Size 13
Up to 16"
6.7" (W) - 51.5" (L)
Capacity
Bag Weight
Height (H)
Width (W)
Depth (D)
Shoe Storage
Laptop Sleeve
Lifting Belt Size
MINI
15 L / 4 GAL
1.2 kg / 2.6 lbs
23cm / 9.1"
38cm / 15"
18cm / 7.1"
Not recommended
iPad
KNKG Belt
SMALL
25 L / 6.6 GAL
1.4 kg / 3.1 lbs
25cm / 9.8"
40cm / 15.7"
25cm / 9.8"
Size 10
Up to 14"
4.5" (W) - 45" (L)
MEDIUM
35 L / 9.2 GAL
1.6 kg / 3.5 lbs
28cm / 11"
45cm / 17.7"
28cm / 11"
Size 10
Up to 16"
6.3" (W) - 45.7" (L)
LARGE
51 L / 13.4 GAL
1.8 kg / 4.0 lbs
32cm / 12.6"
50.8cm / 20"
32cm / 12.6"
Size 13
Up to 16"
6.7" (W) - 51.5" (L)

FAQS

What makes the CORE PRO Large Duffel different?

The CORE PRO Large Duffel is an upgraded version of our best-selling CORE gym bag. It keeps the same proven CORE function, now upgraded with magnetic belt sleeve closures, a larger velcro patch panel, our most heavy-duty shoulder strap, custom hardware and reinforced webbing.

What size is the CORE PRO Large Duffel?

The CORE PRO Large Duffel is a 51L gym duffel, measuring approximately 50.8cm wide x 32cm high x 32cm deep. It weighs 1.8kg / 4.0 lbs and is designed for serious training, lifting gear, shoes, clothes, accessories and everyday essentials.

Does the CORE PRO Large Duffel fit a lifting belt?

Yes. The CORE PRO Large Duffel has a dedicated external lifting belt sleeve designed to fit belts up to approximately 6.7" wide x 51.5" long. The belt sits outside the main compartment, helping save internal packing space for the rest of your gear.

Will it fit other lifting belt brands?

The Large belt sleeve is designed to fit lifting belts up to approximately 6.7" wide x 51.5" long. Other lifting belt brands may vary in thickness, stiffness and shape, so fit can depend on the specific belt.

Does the Large Duffel have shoe storage?

Yes. The CORE PRO Large Duffel has shoe storage designed to fit up to a US men's size 13 shoe. Shoe fit can vary depending on the shoe style, bulk and shape.

Does the CORE PRO Large Duffel fit a laptop?

Yes. The CORE PRO Large Duffel includes a laptop sleeve that fits up to a 16" laptop, making it a practical option for gym-to-work carry, travel days or everyday use.

What should I pack in the CORE PRO Large Duffel?

The Large is ideal for serious gym setups, including shoes, training clothes, wraps, straps, bottles, towels, accessories, a 16" laptop and a lifting belt stored externally. It gives you maximum CORE Duffel packing space while keeping your lifting gear organized.

Should I choose the Medium or Large CORE PRO Duffel?

Choose the Medium if you want a 35L gym duffel for daily training and streamlined carry. Choose the Large if you want maximum packing space, a 51L capacity, shoe storage up to size 13 and the largest external lifting belt sleeve in the CORE PRO Duffel range.

Can I add patches to the CORE PRO Large Duffel?

Yes. The CORE PRO Large Duffel includes a large velcro patch panel so you can customize your setup with compatible patches.

Is the lifting belt included?

No. The lifting belt is sold separately. The CORE PRO Large Duffel includes the dedicated belt sleeve, but the belt itself is not included.

4.8
Rated 4.8 out of 5 stars
Based on 1,173 reviews
Total 5 star reviews: 1k Total 4 star reviews: 107 Total 3 star reviews: 13 Total 2 star reviews: 5 Total 1 star reviews: 12
97%would recommend these products
Slide 1 selected
1,173 reviews
  • KW
    Kelly W.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag
    Rated 5 out of 5 stars
    I love this mini!

    I didn’t need the larger duffle and chose the mini and it did not disappoint.

    Customer service was 10/10 and they sent me measurements to determine if my lever belt would fit and it did.

    Great bag, great company.

  • J
    Jeremy
    Reviewing
    CORE Duffel Waxed Canvas Medium 35L
    I recommend this product
    Rated 4 out of 5 stars
    4 Stars

    Quality of material feels amazing. Design is awesome. Only issue is the snaps for the handles comes undone with no effort. I don’t really use that feature much but it is annoying and if it was a prime feature for me it would be disappointing. Im eyeing the backpack as a daily use bag, maybe next year. Great bag.

  • WW
    Weston W.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Functional Circuit Training, Olympic Lifting, Bodybuilding, Fight & Combat Sports
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Perfect Gym Bag

    Perfect size, great quality, and keeps things simple

  • D
    David
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    Rated 4 out of 5 stars
    4 Stars

    Quality bag. Works as advertised. I have a thick lever belt that makes getting it into the belt pocket a little tricky. The only way they could have improved the bag would have ben to add buckels to the outter straps that hold the belt in place.

  • AJ
    Allan J.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag, Work
    Rated 5 out of 5 stars
    Great for the size

    I bought this size bag because I just needed it to hold my work clothes and some gym equipment for my morning workouts. Perfect for just that! If you want it to hold a lot of things, go with the size up.

CORE PRO Duffel — Large 51L Gym Bag with External Lifting Belt Storage

The KNKG CORE PRO Large is a heavy-duty 51L gym bag with external lifting belt storage, built for lifters who carry a complete training setup.

Keep your weightlifting belt secure outside the bag while the spacious interior carries your shoes, wet gear, laptop, clothing and strength-training accessories.

A Large Gym Bag Designed to Carry a Weightlifting Belt

Weightlifting belts are bulky, rigid and difficult to pack inside a traditional gym duffel. Placing your belt in the main compartment can take up valuable space, press against your other equipment and make the bag harder to organise.

The CORE PRO Large solves this problem with dedicated external weightlifting belt storage. Your belt stays secured to the outside of the duffel, leaving the full 51L interior available for shoes, clothing, recovery equipment and the rest of your training gear.

  • Save Internal Space: Carry your lifting belt externally instead of letting it take over the main compartment.
  • Secure Belt Storage: Keep your belt held against the outside of the bag while travelling to and from the gym.
  • Quick Access: Remove your belt without unpacking your shoes, clothes or lifting accessories.
  • Hands-Free Carry: Attach your belt to the bag instead of carrying it separately.
  • Better Organisation: Keep your lifting belt away from clean clothes, electronics and smaller equipment.

Built Around the Needs of Serious Lifters

The CORE PRO Large is not a generic sports duffel with gym branding added to it. It is a purpose-built weightlifting gym bag designed around the equipment used during powerlifting, bodybuilding, Olympic weightlifting, functional fitness and strength training.

The external lifting belt holder remains the defining feature, giving lifters a practical way to carry one of the largest and most awkward pieces of gym equipment without sacrificing internal storage.

Large 51L Capacity for a Complete Training Setup

The 51L capacity provides room for lifters who carry more than the basic gym essentials. Pack shoes, multiple changes of clothing, lifting accessories, recovery equipment, bottles, a towel and a laptop while keeping your weightlifting belt stored externally.

The larger capacity makes the CORE PRO Large ideal for long training sessions, competition days, gym-to-work routines, coaching, active weekends and short trips.

What Fits Inside the Large 51L CORE PRO Duffel?

Depending on the size and shape of your equipment, the CORE PRO Large can carry:

  • Weightlifting shoes, training shoes or sneakers
  • Multiple changes of training clothes
  • Knee sleeves and elbow sleeves
  • Wrist wraps, lifting straps and grips
  • Chalk, tape and smaller strength-training accessories
  • A full-sized gym towel
  • Shaker bottles and water bottles
  • Headphones and training electronics
  • Snacks, supplements and meal containers
  • Recovery equipment and mobility accessories
  • Phone, wallet, keys and other valuables
  • A laptop

Carrying your lifting belt on the outside leaves more of the spacious interior available for the equipment you need before, during and after training.

Dedicated Shoe Compartment and Wet Zone

The CORE PRO Large includes a separate shoe compartment that keeps footwear away from clean clothing, electronics and smaller gym accessories.

The compartment can also double as a wet zone for damp towels, sweaty training clothes, swimwear or other gear you want separated from the main packing area.

This flexible storage area makes the bag practical for training sessions, swimming, recovery work, travel and any routine where clean and used gear need to stay apart.

Dedicated Laptop Storage

A dedicated laptop compartment makes the CORE PRO Large suitable for carrying work, study or coaching equipment alongside your gym gear.

Keep your laptop separated from shoes, damp clothing and bulky strength-training accessories while moving between home, work, the gym and training events.

External Lifting Belt Storage Without Wasted Space

A lifting belt can be one of the most difficult pieces of gym equipment to pack. Its curved shape, rigid construction and overall size can quickly fill a standard duffel or force you to carry it separately.

The CORE PRO Large keeps the lifting belt outside the main compartment, giving you the benefits of a spacious 51L gym bag without letting the belt consume the space intended for the rest of your equipment.

This makes the bag particularly useful for powerlifters, weightlifters and strength athletes who carry a belt to every session.

Upgraded Heavy-Duty Shoulder Strap

A fully packed 51L gym bag can become heavy. The CORE PRO Large features an upgraded heavy-duty shoulder strap designed to provide stronger support and a more secure carry feel under load.

Reinforced handles and durable webbing provide additional carrying options when moving between the car, gym, workplace, airport or competition venue.

More Ways to Personalise Your Gym Bag

An expanded hook-and-loop panel gives you more room to personalise the CORE PRO Large Duffel with patches. Add your name, gym, training club, country flag, competition patches or KNKG accessories.

The larger patch area also makes your duffel easier to identify in a busy gym, locker room, airport or competition environment.

Heavy-Duty Materials and Construction

  • Durable 500D nylon body material with PVC backing
  • Ripstop nylon interior lining
  • Heavy-duty YKK zippers
  • Upgraded metal hardware
  • Reinforced nylon webbing
  • Heavy-duty shoulder strap
  • Reinforced carry handles
  • Abrasion-resistant construction for demanding daily use

Smarter Organisation for Large Gym Loads

The CORE PRO Large combines a spacious main compartment with dedicated areas for shoes or wet gear, a laptop, bottles, valuables and smaller training accessories.

Instead of placing everything into one oversized compartment, the bag helps separate frequently used items and keeps your equipment easier to find throughout the day.

Optional Internal Dividers

Optional dividers can be added to create separate storage sections inside the main compartment. Use them to organise clothing, sleeves, wraps, supplements, recovery equipment and other training accessories.

The dividers can be repositioned around your preferred packing setup or removed when you need one large open compartment. Dividers are sold separately.

Who Is the Large 51L CORE PRO Duffel For?

The CORE PRO Large is best suited to lifters who carry a substantial amount of equipment and want dedicated external storage for their weightlifting belt.

Choose the 51L size if you regularly carry shoes, multiple outfits, sleeves, wraps, bottles, a full-sized towel, recovery equipment and a laptop, or if you need space for training and short-trip essentials in one bag.

Lifters who carry a smaller daily setup may prefer one of the more compact CORE PRO Duffel sizes.

Why Choose the Large KNKG CORE PRO Duffel?

  • Dedicated external lifting belt holder
  • Large 51L capacity for complete training setups
  • Keeps bulky weightlifting belts outside the main compartment
  • Separate shoe compartment
  • Shoe compartment doubles as a wet zone
  • Dedicated laptop storage
  • Space for clothing, sleeves, wraps and recovery equipment
  • Upgraded heavy-duty padded shoulder strap
  • Expanded hook-and-loop panel for gym patches
  • Heavy-duty zippers and upgraded metal hardware
  • Reinforced webbing and abrasion-resistant materials
  • Optional internal dividers for customised organisation
  • Purpose-built for weightlifting and strength training

Frequently Asked Questions

What is the best large gym bag for carrying a lifting belt?

A large gym bag with dedicated external belt storage allows you to carry a bulky weightlifting belt without sacrificing space inside the main compartment. The CORE PRO Large keeps your belt secured outside the bag while the 51L interior remains available for shoes, clothing, lifting accessories and other equipment.

Does the Large CORE PRO Duffel have a lifting belt holder?

Yes. The Large CORE PRO Duffel includes dedicated external lifting belt storage, allowing your belt to remain secure, accessible and separate from the equipment inside the bag.

Why carry a lifting belt outside a gym bag?

Carrying a weightlifting belt externally prevents its bulky and rigid shape from taking up valuable internal space. It also makes the belt easier to access and keeps it away from clean clothes, electronics and smaller gym accessories.

Is a 51L duffel big enough for a complete gym setup?

Yes. A 51L gym duffel provides space for a substantial training setup, including shoes, clothing, sleeves, wraps, lifting accessories, bottles, a towel, recovery equipment and a laptop while your lifting belt is stored externally.

Does the Large CORE PRO Duffel have shoe storage?

Yes. The Large CORE PRO Duffel includes a dedicated shoe compartment that separates footwear from the main packing area.

Can the shoe compartment be used for wet clothes?

Yes. The shoe compartment can also be used as a wet zone for damp towels, sweaty clothes, swimwear or other used gear that you want to keep separate from clean items.

Can the Large CORE PRO Duffel carry a laptop?

Yes. The Large CORE PRO Duffel includes dedicated laptop storage, making it suitable for carrying gym and work essentials in one organised bag.

Is the Large CORE PRO Duffel suitable for powerlifting?

Yes. Its external lifting belt holder, large capacity, shoe storage and organised compartments make it well suited to carrying powerlifting equipment such as lifting shoes, knee sleeves, wrist wraps, straps, chalk, clothing and recovery gear.

Is the lifting belt included with the CORE PRO Duffel?

No. The CORE PRO Large includes the dedicated external lifting belt storage system, but the lifting belt is sold separately.

Are the internal dividers included?

No. Internal dividers are optional accessories sold separately. They can be added to create customised sections inside the 51L main compartment.

What is the difference between the Medium and Large CORE PRO Duffels?

The Medium CORE PRO has a 35L capacity designed for complete daily gym setups. The Large increases capacity to 51L, providing more space for clothing, recovery equipment, larger training loads and short-trip essentials.

What is the difference between the CORE and CORE PRO Duffel?

The CORE PRO builds on the original CORE Duffel with upgraded external lifting belt storage, a heavier-duty shoulder strap, improved hardware, reinforced webbing and a larger hook-and-loop panel for additional personalisation.

Can the Large CORE PRO Duffel be used as a work and gym bag?

Yes. Its laptop storage, shoe compartment, wet zone and spacious 51L capacity make it suitable for carrying work and gym equipment in one bag.

Can the Large CORE PRO Duffel be used for travel?

Yes. The 51L capacity provides room for clothing and equipment for short trips, although the bag’s main features and organisation are purpose-built around gym gear and strength training.