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CORE Duffel

Designed for weightlifters. Made for maxing.

4.8
Rated 4.8 out of 5 stars
4.8 Stars (631 Reviews)
Select Size: Medium - 35L
Select Color: Green
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Duffel Divider
Duffel Divider
$39.95 $49.95
Lifting Belt
Lifting Belt
$39.95 $59.95
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FREE US SHIPPING OVER $149Military & Emergency discountRush shipping available (US only)FREE FIRST RETURN
  • 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. This beefed up 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

CORE DUFFEL
SIZE COMPARISON

MEDIUM DUFFEL

LARGE DUFFEL

CAPACITY

35 L / 9.2 GAL

51 L / 13.4 GAL

BAG WEIGHT

0.8 kg / 1.8 lbs

1 kg / 2.2 lbs

HEIGHT (H)

28cm / 11"

32cm / 12.6"

WIDTH (W)

45cm / 17.7"

50.8cm / 20"

DEPTH (D)

28cm / 11"

32cm / 12.6"

SHOE STORAGE

Size 10

Size 13

LAPTOP SLEEVE

Up to 13"

Up to 15"

LIFTING BELT SIZE

6.3" (W) - 45.7" (L)

6.7" (W) - 51.5" (L)

Designed for weightlifting.

With max support comes max gains.

Get the support you need, every time you step into the gym. With the unique external weightlifting belt attachment, you'll never have to waste space inside your gym bag again.

Made for maxing.

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.

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.

4.8
Rated 4.8 out of 5 stars
Based on 631 reviews
Total 5 star reviews: 546 Total 4 star reviews: 74 Total 3 star reviews: 5 Total 2 star reviews: 2 Total 1 star reviews: 4
98%would recommend this product
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631 reviews
  • MB
    Michael B.
    Verified Buyer
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Every Day Carry, Work
    Rated 5 out of 5 stars
    Awesome bag

    This bag has a lot of room, plenty of room for my day to day carry to work bag. Its fabric is also strong enough to withstand the abuse I put things through somehow. It looks brolic also. Thanks

    Was this helpful?
  • CD
    Cody D.
    Verified Buyer
    I recommend this product
    What type of training is your KNKG bag supporting you with? Bodybuilding, Other
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Gym Hero

    This bag facilitates a life full of activity.

    Big enough to carry anything i could need for multiple workouts but also stylish and sleek.

    I am the talk of the town at both the gym and the yoga studio.

    Was this helpful?
  • AM
    Austin M.
    Verified Buyer
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag, Every Day Carry, Work, Sport / Fitness
    Rated 5 out of 5 stars
    The Duffel That Redefines Excellence

    There are duffel bags… and then there is the KNKG Core Duffel. I didn’t just purchase a bag—I upgraded my lifestyle. From the moment I unzipped the sleek, jet-black exterior, I knew this wasn’t just a travel companion; it was a statement piece of intelligent design, rugged style, and unapologetic utility.

    The black exterior is all business—understated, modern, and sharp. Whether you’re walking into a gym, a terminal, or a boardroom, it says one thing: this person knows what they’re doing. But open it up and you’re greeted with the warm, sophisticated beige duffel dividers that give the interior a clean, classy contrast. The organization this system offers is borderline magical. Each divider feels tailor-made for your life—gym gear, tech, shoes, supplements, chargers, notebooks—everything has its place, and it stays in its place. No more rummaging, no more tangled chaos.

    The materials? Premium. The construction? Flawless. Every stitch, every zipper, every magnetic clasp radiates intention and quality. You feel it the moment you lift the bag—it’s sturdy, balanced, and comfortable to carry, whether slung over your shoulder or held by the reinforced handles.

    In a world full of over-promising gear, the KNKG Core Duffel over-delivers. If you’re looking for something that elevates your everyday carry to an elite level of function and form—this is it.

    Buy it. Experience it.

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  • A
    Abbey
    I recommend this product
    Rated 5 out of 5 stars
    5 Stars

    This bag is great. Plenty of room for all.the necessary supplies for the gym.

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  • NM
    Naomi M.
    Verified Buyer
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Bodybuilding, Other
    Using For: Gym Bag, Sport / Fitness, Every Day Carry, Work
    Rated 5 out of 5 stars
    THE Bag!

    This is the best bag I own! I am a collector of bags and duffels each of which serve a specific purpose. I own two KNKG duffels and their corresponding dividers. They are great for traveling and especially helpful for packing military gear. I love them so much I gifted one to my man because he had a terrible gym bag. We are avid bodybuilders so we have a ton of gear and supplements. 12/10 recommend

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