Man wearing black CORE Duffel over shoulder in gym, with American Flag in background
Man carrying black CORE Duffel in gym
Black CORE Duffel with green lifting belt inside sleeve, held in women's hand, inside dark gym
Black CORE Duffel sitting on wooden box
Side profile of Black CORE duffel with matching weight lifting belt attached
360* views of black CORE Duffel
Front view of black CORE Duffel sitting on wooden box
Flat lay of black CORE duffel with gym essentials
Birds eye view of black CORE Duffel packed with KINGKONG hoodie, KNKG green lifting belt, skipping rope, iPad and workout accessories
Divider organization system packed inside black CORE Duffel
Birds eye view of empty black CORE Duffel, showing internal pockets and compartments
NOBULL sneakers inside black CORE Duffel shoe compartment
KNKG Drink bottle and Blender Shaker Bottle packed inside black CORE Duffel bottle pockets
Close up of KNKG zippers and metal buckles on black CORE Duffel
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 (747 Reviews)
$169.95
Size: Medium 35L
Mini 15L
Mini 15L
Medium 35L
Medium 35L
Large 51L
Large 51L
Color: Black
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 BEST SELLING GYM DUFFEL WITH LIFTING BELT ATTACHMENT

  • 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 747 reviews
Total 5 star reviews: 645 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
747 reviews
  • JW
    Joshua W.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Other, Functional Circuit Training, CrossFit
    Using For: Gym Bag, Sport / Fitness, Every Day Carry
    Rated 5 out of 5 stars
    Love this bag

    Like the title states, I love this duffel. I like bringing a gym bag in with me for extra storage and carrying space, but I didn't want a huge duffel that got in the way or became a tripping hazard inside the gym. I was using a sling, but it was too small for most things. This bag perfectly holds my water bottle, preworkout supps, and other gear. It's also extremely easy to slide my keys and wallet into the side pocket. 10/10 bag. I even use this on small overnight trips, as well. Build quality is amazing, too.

    Was this helpful?
  • TW
    Tracey W.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Other
    Using For: Sport / Fitness, Every Day Carry
    Rated 4 out of 5 stars
    Excellent!

    This is an AMAZING bag! Strong. Sturdy and well made. Originally we ordered a smaller version but upon arrival it was clear the medium bag was too small for what was needed. The exchange process was very simple, quick and truly made me believe in customer service again. What a great company.! Proud to own an American made excellent product! Thank you!!

    Was this helpful?
  • NS
    Nick S.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Bodybuilding
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Perfect Bag

    Best gym duffle I’ve owned. Perfect size and the inserts are a huge plus.

    Was this helpful?
  • CM
    Charles M.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Other
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Perfect size

    I only stay at the gym for 45 minutes or less. So the size is perfect for the few things that I need to store. The water bottle holder is the number 1 reason why I bought the bag.

    Was this helpful?
  • CG
    Cesar G.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? CrossFit, Weightlifting
    Using For: Gym Bag, Every Day Carry, Sport / Fitness
    Rated 5 out of 5 stars
    Perfect minimalist bag

    Perfect size! I can fit my lifting shoes, belt and knee sleeves plus more stuff in the side pockets.

    Was this helpful?
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