CORE PRO Duffel Medium 35L
THE NEXT EVOLUTION OF OUR BEST-SELLING GYM DUFFEL
OUR BEST SELLERS, BUILT TOUGHER
Built for serious training, the CORE PRO Duffel gives you more room for your daily gym setup without adding unnecessary bulk.
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 Medium 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: 28cm H x 45cm W x 28cm D / 11" H x 17.7" W x 11" D
- Fits up to size 10 shoes
- Designed to fit training essentials - accessories, wraps, straps, towel, water bottle, shoes 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.
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.
Carry it hands-free
No more carrying your belt separately or forcing it inside your bag.
Save internal space
Keep more room inside for shoes, clothes, towels, bottles and daily gym gear.
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.
Magnetic Belt Sleeve
Upgraded from velcro to magnetic snaps for faster, cleaner and more secure belt storage.
Large Velcro Patch Panel
Built for added customization. Attach your favourite patches and make your CORE PRO setup your own.
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.
Custom Hardware & Reinforced Webbing
Finished with custom hardware and double-reinforced webbing in high-stress areas for a tougher, more dependable build.
SIZE COMPARISON
FAQS
What makes the CORE PRO Medium Duffel different?
The CORE PRO Medium 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 Medium Duffel?
The CORE PRO Medium Duffel is a 35L gym duffel, measuring approximately 45cm wide x 28cm high x 28cm deep. It weighs 1.6kg / 3.5 lbs and is designed for daily gym sessions, lifting gear, shoes, training accessories and everyday essentials.
Does the CORE PRO Medium Duffel fit a lifting belt?
Yes. The CORE PRO Medium Duffel has a dedicated external lifting belt sleeve designed to fit belts up to approximately 6.3" wide x 45.7" 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 Medium belt sleeve is designed to fit lifting belts up to approximately 6.3" wide x 45.7" long. Other lifting belt brands may vary in thickness, stiffness and shape, so fit can depend on the specific belt.
Does the Medium Duffel have shoe storage?
Yes. The CORE PRO Medium Duffel has shoe storage designed to fit up to a US men's size 10 shoe. Shoe fit can vary depending on the shoe style, bulk and shape.
Does the CORE PRO Medium Duffel fit a laptop?
Yes. The CORE PRO Medium Duffel includes a laptop sleeve that fits up to a 16" laptop, making it a practical option for gym-to-work carry or everyday use.
What should I pack in the CORE PRO Medium Duffel?
The Medium is ideal for daily gym essentials like shoes, training clothes, wraps, straps, bottles, towels, accessories, a 16" laptop and a lifting belt stored externally. It gives you more room than the Small while still keeping your gym carry streamlined.
Should I choose the Small or Medium CORE PRO Duffel?
Choose the Small if you want a compact 25L gym duffel for lighter daily carry. Choose the Medium if you want more packing space, a 35L capacity, up to 16" laptop storage and a larger external lifting belt sleeve.
Can I add patches to the CORE PRO Medium Duffel?
Yes. The CORE PRO Medium 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 Medium Duffel includes the dedicated belt sleeve, but the belt itself is not included.
- WWWeston W.Verified BuyerReviewingCORE Duffel Mini 15LI recommend this productWhat type of training is your KNKG bag supporting you with? Weightlifting, Functional Circuit Training, Olympic Lifting, Bodybuilding, Fight & Combat SportsUsing For: Gym BagRated 5 out of 5 starsPerfect Gym Bag
Perfect size, great quality, and keeps things simple
- DDavidReviewingCORE Duffel Medium 35LI recommend this productRated 4 out of 5 stars4 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.
- AJAllan J.Verified BuyerReviewingCORE Duffel Mini 15LI recommend this productWhat type of training is your KNKG bag supporting you with? WeightliftingUsing For: Gym Bag, WorkRated 5 out of 5 starsGreat 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.
- KKenReviewingCORE Duffel Medium 35LI recommend this productRated 5 out of 5 stars5 Stars
Love this bag, fits everything I need
- MZMykola Z.Verified BuyerReviewingCORE Duffel Medium 35LI recommend this productWhat type of training is your KNKG bag supporting you with? WeightliftingUsing For: Gym BagRated 5 out of 5 starsMy new everyday gym bag
I bought this bag about a month ago, and I absolutely love it! It’s the perfect gym bag! I can easily fit my lifting belt, sneakers, a change of clothes, two water bottles, flip-flops, and everything else I need for my workouts. 35L is a perfet size, super practical, and looks amazing too!
CORE PRO Duffel — Medium 35L Gym Bag with External Lifting Belt Storage
The KNKG CORE PRO Medium is a heavy-duty 35L gym duffel with external lifting belt storage, built for weightlifters, powerlifters and serious strength training.
Keep your lifting belt secured outside the bag while the organised interior carries your shoes, clothes, training accessories, bottles, valuables and laptop.
A 35L Gym Duffel Designed to Carry a Lifting Belt
Weightlifting belts are bulky and can take up valuable space inside a traditional gym bag. Packing your belt in the main compartment leaves less room for shoes, clothes, knee sleeves, wraps and other training equipment.
The CORE PRO Medium solves this problem with a dedicated external weightlifting belt sleeve. Your lifting belt stays secured to the outside of the duffel, where it remains easy to access without taking over the 35L main compartment.
- Save Internal Space: Carry your lifting belt externally and leave more room inside for the rest of your gym gear.
- Secure Belt Storage: Magnetic snaps help keep the lifting belt sleeve firmly closed while you are on the move.
- Quick Access: Remove your belt without unpacking your shoes, clothes or training accessories.
- Hands-Free Carry: Keep your lifting belt attached to your gym bag instead of carrying it separately.
Versatile 35L Capacity for Daily Gym Training
The CORE PRO Medium provides enough room for a complete daily gym setup without becoming unnecessarily oversized. Its 35L capacity gives you space for shoes, clothing, lifting equipment, bottles and everyday essentials in a practical medium-sized duffel.
It is ideal for lifters who want more packing room than a compact gym bag while maintaining a streamlined size that is easy to carry between home, work and the gym.
Built for Weightlifting, Powerlifting and Strength Training
The CORE PRO Medium is not a generic sports bag with gym branding added to it. It is a purpose-built weightlifting gym bag designed around the equipment used during powerlifting, bodybuilding, Olympic lifting, functional fitness and strength training.
Use it for daily workouts, commercial gyms, powerlifting clubs, bodybuilding sessions, CrossFit training, weightlifting competitions, gym-to-work carry or active weekends away.
What Fits Inside the Medium 35L CORE PRO Duffel?
The 35L interior provides room for a complete everyday gym setup while your lifting belt remains stored externally. Depending on the size and shape of your equipment, the CORE PRO Medium can carry:
- Weightlifting shoes, training shoes or sneakers
- A change of gym clothes
- Knee sleeves and elbow sleeves
- Wrist wraps, lifting straps and grips
- Chalk, tape and smaller lifting accessories
- A full-sized gym towel
- Shaker bottles and water bottles
- Headphones and training electronics
- Snacks and post-workout supplements
- Phone, wallet, keys and other valuables
- A laptop up to 16 inches
Carrying your lifting belt on the outside leaves more of the bag’s internal capacity available for the equipment you need before, during and after training.
Dedicated Shoe Storage
The CORE PRO Medium includes dedicated shoe storage designed to fit footwear up to approximately a US men’s size 10. Shoe fit may vary depending on the style, shape and bulk of the footwear.
Separating your shoes from the main packing area helps keep footwear organised and away from clean clothing, electronics and smaller training accessories.
Laptop Storage up to 16 Inches
A dedicated laptop sleeve fits devices up to approximately 16 inches, making the CORE PRO Medium practical for carrying your equipment between home, work and the gym.
Its combination of gym-focused storage and laptop protection makes it a versatile option for lifters who want to carry their work and training essentials in one bag.
Magnetic External Lifting Belt Sleeve
The upgraded external lifting belt sleeve uses magnetic snaps for faster, cleaner and more secure belt storage. The magnetic closure helps lock the sleeve in place while keeping your belt easy to remove when it is time to train.
The Medium CORE PRO Duffel is designed to carry lifting belts up to approximately 6.3 inches wide and 45.7 inches long. Compatibility may vary depending on the belt’s thickness, stiffness, shape and construction.
Dual Bottle Storage
Dedicated external bottle holders provide convenient access to your water bottle and shaker without using valuable space inside the main compartment.
Carry two bottles for water, supplements or pre-workout while keeping liquids separated from clothes, electronics and other gym equipment.
Upgraded Heavy-Duty Shoulder Strap
Shoes, lifting equipment, bottles and clothing can quickly make a gym bag heavy. The CORE PRO Medium features KNKG’s most heavy-duty shoulder strap to date, with a stronger build, padded support and a more secure carry feel.
Reinforced grab handles and durable webbing provide additional carrying options when moving between home, work, the gym and training events.
More Ways to Personalise Your Gym Bag
A larger hook-and-loop panel gives you more space to personalise the CORE PRO Medium Duffel with patches. Add your name, gym, country flag, training club, competition patches or KNKG accessories to make the bag your own.
The expanded patch area also makes it easier to identify your duffel in a busy gym, locker room or competition environment.
Heavy-Duty Materials and Construction
- Durable 500D nylon body material with PVC backing
- Ripstop nylon internal lining
- Heavy-duty YKK zippers
- Magnetic snap closure on the lifting belt sleeve
- Powder-coated steel buckles and custom hardware
- Reinforced nylon webbing straps and handles
- Double-reinforced webbing in high-stress areas
- Abrasion-resistant construction for demanding daily use
Smarter Organisation for Your Gym Equipment
The CORE PRO Medium combines a spacious main compartment with dedicated storage for footwear, a laptop, bottles, valuables and smaller training accessories.
Instead of relying on one large unstructured compartment, the bag helps separate frequently used items and makes it easier to find your equipment without emptying the entire duffel onto the gym floor.
Optional Internal Dividers
Optional dividers can be added to further organise the main compartment. Use them to create separate areas for clothing, sleeves, wraps, accessories, supplements and other training equipment.
The dividers can be arranged around your preferred packing setup or removed when you need one larger open compartment. Dividers are sold separately.
Who Is the Medium 35L CORE PRO Duffel For?
The CORE PRO Medium is best suited to lifters who want dedicated lifting belt storage and enough capacity for a complete daily gym setup. It offers more packing space than the Small while remaining easier to carry than an oversized gym or travel duffel.
Choose the Medium 35L size if you regularly carry one pair of shoes, training clothes, lifting accessories, bottles, a towel and a laptop up to 16 inches. Choose the Large CORE PRO Duffel if you carry larger footwear, multiple outfits or significantly more training and travel equipment.
Why Choose the Medium KNKG CORE PRO Duffel?
- External lifting belt holder designed for weightlifters
- Versatile 35L capacity for everyday gym training
- Magnetic belt sleeve for faster and more secure storage
- Lifting belt compatibility up to approximately 6.3 inches wide and 45.7 inches long
- Dedicated shoe storage for footwear up to approximately a US men’s size 10
- Laptop sleeve for devices up to approximately 16 inches
- Dual external bottle holders
- Secure quick-access storage pockets
- Upgraded heavy-duty padded shoulder strap
- Expanded hook-and-loop panel for gym patches
- Heavy-duty YKK zippers and powder-coated steel hardware
- Double-reinforced webbing in high-stress areas
- Optional internal dividers for additional organisation
- Purpose-built for strength training rather than generic everyday carry
Frequently Asked Questions
What is the best gym bag for carrying a lifting belt?
A gym duffel with dedicated external belt storage allows you to carry a bulky weightlifting belt without sacrificing valuable space inside. The CORE PRO Medium includes an external lifting belt sleeve designed to keep your belt secure, accessible and separate from the rest of your equipment.
Does the Medium CORE PRO Duffel have a lifting belt holder?
Yes. The Medium CORE PRO Duffel includes a dedicated external lifting belt sleeve with magnetic snap closures. This allows your belt to remain secured outside the 35L main compartment.
What size lifting belt fits the Medium CORE PRO Duffel?
The external belt sleeve is designed to fit lifting belts up to approximately 6.3 inches wide and 45.7 inches long. Fit may vary depending on the belt’s thickness, stiffness, shape and construction.
Is a 35L duffel big enough for the gym?
A 35L gym duffel provides enough capacity for most complete daily training setups. The CORE PRO Medium can carry shoes, clothing, sleeves, wraps, lifting accessories, bottles, a towel, valuables and a laptop while your lifting belt remains stored externally.
Does the Medium CORE PRO Duffel have shoe storage?
Yes. The Medium CORE PRO Duffel includes dedicated shoe storage designed to fit footwear up to approximately a US men’s size 10. Fit can vary depending on the style, shape and bulk of the shoes.
Can the Medium CORE PRO Duffel carry a laptop?
Yes. The Medium CORE PRO Duffel includes a laptop sleeve designed to fit devices up to approximately 16 inches.
Is the Medium CORE PRO Duffel suitable for powerlifting?
Yes. Its external lifting belt holder, shoe storage and organised 35L capacity make it well suited to carrying common powerlifting equipment such as lifting shoes, knee sleeves, wrist wraps, straps, chalk, bottles and training clothes.
Is the lifting belt included with the CORE PRO Duffel?
No. The CORE PRO Medium includes the dedicated external lifting belt sleeve, 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 storage sections inside the main compartment.
What is the difference between the Small and Medium CORE PRO Duffels?
The Small CORE PRO has a compact 25L capacity and is designed for lighter everyday carry. The Medium increases capacity to 35L, fits a laptop up to 16 inches and provides a larger external lifting belt sleeve for bigger training setups.
What is the difference between the Medium and Large CORE PRO Duffels?
The Medium CORE PRO has a versatile 35L capacity designed for complete daily gym setups. The Large provides 51L of space, larger shoe storage and more room for additional clothing, larger accessories or travel equipment.
What is the difference between the CORE and CORE PRO Duffel?
The CORE PRO builds on the original CORE Duffel with magnetic external belt storage, an upgraded heavy-duty shoulder strap, improved custom hardware, reinforced webbing and a larger hook-and-loop panel for greater patch personalisation.
Can the Medium CORE PRO Duffel be used as a work and gym bag?
Yes. Its 35L capacity, shoe storage, laptop sleeve and organised accessory pockets make it suitable for carrying work and gym essentials in one bag.
Can the Medium CORE PRO Duffel be used for weekend travel?
Yes. The 35L capacity can also accommodate clothing and essentials for short trips, although the bag’s primary layout and features are designed around gym equipment and strength training.