CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L
CORE Duffel Medium 35L

CORE Duffel Medium 35L

4.8
Rated 4.8 out of 5 stars
4.8 Stars (707 Reviews)
Size: Medium 35L
Mini 15L
Mini 15L
Medium 35L
Medium 35L
Large 51L
Large 51L
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Green
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  • 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)

Designed for weightlifting.

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 707 reviews
Total 5 star reviews: 609 Total 4 star reviews: 77 Total 3 star reviews: 7 Total 2 star reviews: 3 Total 1 star reviews: 11
97%would recommend these products
Slide 1 selected
707 reviews
  • DJ
    Donald J.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag
    Rated 5 out of 5 stars
    Duffel bag

    Amazing product. Definitely recommend.

    Was this helpful?
  • AG
    Andrew G.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag, Sport / Fitness
    Rated 5 out of 5 stars
    The Perfect No-Nonsense Gym Bag

    The KNKG Core Duffel nails the balance between functionality and clean design. The exterior water bottle pockets are a standout — deep enough to securely hold your shaker or Hydro Flask without feeling bulky. Inside, the zippered pockets are perfect for stashing keys, headphones, and other small essentials, keeping them organized instead of floating around the main compartment.

    The material feels durable and gym-ready, and the layout shows that KNKG actually thought through how people pack their bags. If you’re tired of overbuilt bags with gimmicks or basic ones with no structure, this hits the sweet spot.

    Overall: smart layout, quality build, and no fluff.

    Was this helpful?
  • J
    Justin
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    Rated 5 out of 5 stars
    5 Stars

    This bag is awesome. Perfect size with all kinds of storage space.

    Was this helpful?
  • WS
    Winston S.
    Verified Buyer
    Reviewing
    CORE Duffel Medium 35L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag, Work
    Rated 5 out of 5 stars
    Love this bag!

    I loved my Core Duffel so much that I bought a second one!

    Was this helpful?
  • SM
    Shane M.
    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 Bag

    The bag fits my needs perfectly. I am able to get all my gear in it and organized. I upgraded to this bag because I wanted to be able to get multiple pairs of shoes in the bag. I am also enjoying having my belt out of the way by having strapped to the outside.

    Was this helpful?
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