Man wearing green CORE Duffel over shoulder in gym
Man holding green CORE Duffel in fist
Green CORE Duffel sitting on wooden box with matching green weight lifting belt
Green CORE duffel side profile
360* view of green CORE duffel with matching lifting belt attached
Front view of green CORE Duffel
Birds eye view flat lay green CORE Duffel
Sneakers packed inside of green CORE Duffel shoe compartment
Birds eye view of green CORE Duffel packed with skipping rope, wrist wraps, laptop, lifting belt and gym towel.
Internal divider organization system inside green CORE Duffel packed with bottles, sweatshirt, socks and mobility accessories
Birds eye view of empty green CORE Duffel, showing internal pockets and laptop sleeve
Water bottle and shaker bottle inside green CORE Duffel pockets
Close up of zippers and metal buckles on green CORE Duffel
Man wearing green CORE Duffel over shoulder, standing in front of black brick wall
Side by side of man and woman wearing medium CORE Duffel
Medium and large CORE Duffel stacked on top of each other, showing size difference
Side by side of large and medium CORE Duffel showing size difference

CORE Duffel Medium 35L

4.8
Rated 4.8 out of 5 stars
4.8 Stars (766 Reviews)
$169.95
Size: Medium 35L
Mini 15L
Mini 15L
Medium 35L
Medium 35L
Large 51L
Large 51L
Color: Green
Black
Black
Natty
Natty
Green
Green
Desert
Desert
Limited Edition - Waxed Canvas:
Camo
Camo
Traditional
Traditional
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Duffel Divider
Duffel Divider
$39.95 $49.95
Lifting Belt
Lifting Belt
$39.95 $59.95
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OUR TOP RATED GYM DUFFEL FOR WEIGHTLIFTING 

  • External weightlifting belt attachment
  • 13/15” Internal laptop sleeve
  • Sealed internal shoe compartment
  • Dual bottle pockets 

Do you even lift? If so, meet your new favorite lifting partner. Say goodbye to your belt taking up precious space in your bag, with this unique and specially designed lifting belt attachment that ensures functionality isn’t compromised whatsoever. The CORE Duffel is made to store everything you need and support you every time you step into the gym.

(Lifting belt sold separately)

Covered by our promise to be free of defects in material or workmanship within its practical lifetime. If there is a defect in materials or workmanship KNKG will repair or replace your bag, including free shipping.

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 Duffel is made from:

  • 500D nylon body material (PVC backing)
  • YKK zippers
  • Powder-coated steel buckles
  • Ripstop nylon lining
  • Nylon webbing
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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
0.6 kg / 1.3 lbs
23cm / 9.1"
38cm / 15"
18cm / 7.1"
Not recommended
iPad
KNKG Belt
MEDIUM
35 L / 9.2 GAL
0.8 kg / 1.8 lbs
28cm / 11"
45cm / 17.7"
28cm / 11"
Size 10
Up to 13"
6.3" (W) - 45.7" (L)
LARGE
51 L / 13.4 GAL
1 kg / 2.2 lbs
32cm / 12.6"
50.8cm / 20"
32cm / 12.6"
Size 13
Up to 15"
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 / 3.96 GAL
0.6 kg / 1.3 lbs
23cm / 9.1"
38cm / 15"
18cm / 7.1"
Not recommended
iPad
KNKG Belt
MEDIUM
35 L / 9.2 GAL
0.8 kg / 1.8 lbs
28cm / 11"
45cm / 17.7"
28cm / 11"
Size 10
Up to 13"
6.3" (W) - 45.7" (L)
LARGE
51 L / 13.4 GAL
1 kg / 2.2 lbs
32cm / 12.6"
50.8cm / 20"
32cm / 12.6"
Size 13
Up to 15"
6.7" (W) - 51.5" (L)

Workouts are tough but these bags are tougher. Effortless to carry and palpably robust. This thing does it all and measures in at the perfect size.

Designed for serious lifters who crave serious organization.

This is the best gym bag for powerlifters. Many amazing features that set this bag apart from its rivals. The outer material is tough, durable, and lightweight while also being water resistant and easy to clean.

FAQS

The main difference is the unique weightlifting belt attachment. This feature allows the bag be used as normal, while carrying a cumbersome lifting belt on the outside. Other changes are the volume (35L) and the layout.

Most of the materials are the same as used in other KNKG bags. YKK zippers, heavy duty buckles, nylon lining and webbing are all the same. In the CORE range, we have gone for a lighter 500D nylon outside and a new velcro logo feature that allows you to go 'incognito' with your own patches.

Measure the widest point of your belt and its length.

The CORE35 (medium) duffel can fit a belt up to 6.3"/16cm wide and 45.7"/116cm long.
The CORE51 (large) duffel can fit a belt up to 6.7"/17cm wide and 45.7"/116cm long.

A lever belt can fit, but you should count the lever into your measurement.

The CORE35 (Medium) will fit size 10 shoes. The CORE51 (Large) will fit size 13 shoes. Larger shoe sizes will fit our PLUS Duffel.
4.8
Rated 4.8 out of 5 stars
Based on 766 reviews
Total 5 star reviews: 664 Total 4 star reviews: 81 Total 3 star reviews: 7 Total 2 star reviews: 3 Total 1 star reviews: 11
97%would recommend these products
Slide 1 selected
766 reviews
  • GC
    Gregory C.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Functional Circuit Training, Other
    Using For: Gym Bag, Sport / Fitness, Every Day Carry
    Rated 5 out of 5 stars
    Hi quality Duffel

    I have to say this is a near perfect Duffel bag!!! The company is top notch with their customer service. I wanted to exchange something and they were more than accommodating in assisting me in the process. The quality of the bag is top notch. This bag will no doubt be the last one I purchase as I believe it will stand the test of time.

    Just 2 suggestions in design. First a solid handle at one end of the bad to make it convenient to pull out of airplane carrying on bin or just to grab and hold it vertical and second use the larger zippers on the side storage pockets instead of the small zippers which can be difficult to close and open around the corners.

    Seriously a great bad!!!

    Was this helpful?
  • SH
    Steven H.
    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
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Exceeded my expectations!!

    Best gym bag I have ever owned (and I’ve had many). The bag’s design and build are excellent. Not only is it easy to access items in the bag while working out, but it doesn’t fall over onto the floor like my backpacks did. I only wish I had this bag years ago. Well done!!👍

    Was this helpful?
  • TW
    Tracey W.
    Verified Buyer
    Reviewing
    CORE Duffel Large 51L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Other, None - I don't use my bag for training
    Using For: Gym Bag, Sport / Fitness, Every Day Carry
    Rated 5 out of 5 stars
    Rugged!!!

    What an Amazing bag! Well made and durable. We needed to exchange the bag for a larger one and that was an amazing experience. The return was handled with ease and efficiency. It takes a lot to impress me and this company truly stepped up! Very impressive. Thank you!!

    Was this helpful?
  • BG
    Brent G.
    Verified Buyer
    Reviewing
    CORE Duffel Waxed Canvas Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Bodybuilding, Fight & Combat Sports
    Using For: Every Day Carry, Sport / Fitness
    Rated 5 out of 5 stars
    Best bag ever

    This bag came in handy more than any other one. Its great for throwing overnight things in or just loading up items for the day. The wax coat makes it look amazing and it is 100% waterproof. I have three of these bags and backpacks and i wont buy another bag other thatn KNKG

    Was this helpful?
  • G
    Garrett
    Reviewing
    CORE Duffel Large 51L
    I recommend this product
    Rated 5 out of 5 stars
    5 Stars

    Love this bag!!

    Was this helpful?
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