CORE Duffel Large 51L
Man inside gym wearing large black KNKG CORE Duffel over shoulder
Man wearing large black KNKG CORE Duffel over shoulder, showing lifting belt wrapped around bag, inside sleeve
Side view of large black KNKG CORE Duffel with lifting belt
CORE Duffel Large 51L
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Side view of large black KNKG CORE Duffel with matching black lifting belt packed in sleeve
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Birds eye view of large black KNKG CORE Duffel fully packed with gym gear
Birds eye view of internal divider organization system packed inside large black KNKG CORE Duffel
Drink bottle and shaker packed inside large black KNKG CORE Duffel bottle pockets
NOBULL sneakers packed inside large black KNKG CORE Duffel wet zone / shoe compartment
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CORE Duffel Large 51L
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Side by side of large and medium CORE Duffel showing size difference
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CORE Duffel Large 51L

4.8
Rated 4.8 out of 5 stars
4.8 Stars (1,309 Reviews)
$180 $200
Size: Large 51L
Mini 15L
Mini 15L
Medium 35L
Medium 35L
Large 51L
Large 51L
Color: Black
Black
Green
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Duffel Divider
Duffel Divider
$50 $60
Matching Lifting Belt
Matching Lifting Belt
$50 $60
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Want the PRO version? Check out the new CORE PRO Duffel →

BEST SELLING GYM DUFFEL WITH DEDICATED LIFTING BELT STORAGE

  • 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 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 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
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)

Designed for weightlifting.

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.

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.
4.8
Rated 4.8 out of 5 stars
Based on 1,309 reviews
97%would recommend these products
Slide 1 selected
1,309 reviews
  • JC
    Janet C.
    Verified Buyer
    Reviewing
    CORE PRO Duffel Mini 15L
    I recommend this product
    Rated 5 out of 5 stars
    Compact duffel

    As advertised perfect for gym workout gear

    Was this helpful?
  • AH
    Allen H.
    Verified Buyer
    Reviewing
    CORE PRO Duffel Medium 35L
    I recommend this product
    Rated 5 out of 5 stars
    More Than Just a Gym Bag

    I originally purchased the KNKG CORE PRO 35L for the gym, which I hit about three times a week, but it's quickly become my go-to bag for work and short trips as well. The storage and dividers are probably my favorite features. Everything has its place, and there's plenty of room without the bag feeling unnecessarily bulky. It's just a really well-thought-out design. I've gone through my fair share of bags from other athletic brands, and most haven't held up particularly well. This one has been a different story. The quality and durability have genuinely impressed me, especially with how often I use it. If you're looking for something that works just as well for everyday use and weekend travel as it does for the gym, I'd absolutely recommend it. It's been worth the money.

    Was this helpful?
  • PL
    Paul L.
    Verified Buyer
    Reviewing
    CORE PRO Duffel Mini 15L
    I recommend this product
    Rated 5 out of 5 stars
    Great little bag

    Great bag to take with you machine to machine if you have some attachments and grips.

    Was this helpful?
  • B
    Brian
    Reviewing
    CORE Duffel Waxed Canvas Medium 35L
    I recommend this product
    Rated 5 out of 5 stars
    5 Stars

    Bag was amazing, was a little smaller than I expected so will order the large version for the gym.

    Was this helpful?
  • AC
    Alex C.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Bodybuilding
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Awesome gym bag

    You can tell this is constructed with quality material, feels durable and there is tons of space for everything you need for a solid gym session. Also don't sleep on the fact that it has an integrated outside sleeve for your belt which fits my lever belt perfectly and saves me room on the inside main compartment.

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