Named "Best Gym Bags to Keep Your Training Goals In" by Gear Patrol in 2024.

WE’RE SERIOUS ABOUT OUR GEAR

SHOP CORE DUFFEL
PACK

Pack all your essentials. Fits gym clothes, supplements, lifting gear, and even your laptop.

 LOAD

Designed to take a beating. Load up with confidence thanks to sturdy 500D nylon and heavy duty buckles.

 CUSTOMIZE

Customize your internal configuration. Removable dividers allow you to add or remove compartments easily.
PACK
LOAD
CUSTOMIZE
SHOP CORE DUFFEL
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Secure-zip outer pockets:

Keep snacks, keys, and other small personal items easily accessible.

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All in one place:

External weightlifting belt attachment
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Designated shoe compartment:

Keep sweaty footwear.

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Easy to carry:

Padded straps for comfortable shoulder hold.
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

Designed for weightlifters. Made for maxing.

(767)
$169.95

Highlights

Gear Patrol's Best Gym Bag of 2024Generation Iron Rated 'Best Powerlifting Gym Bag'Powerlifting Technique's Top Pick Best Gym BagUnique weightlifting belt attachment
Select Size:
Select Color:Black
Free, no-questions asked returnsMilitary & Emergency discount2-day shipping available (US only)Free US shipping over $149
  • 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.
Simply Amazing.Eben C.

“The bag is great! Feels well-made and durable. Got the belt to go with it and it fits perfectly without giving up any extra space.”

Extremely durable.Arie K.

The pockets are designed intelligently and make for excellent organization. Works best when you pair with the dividers. Highly recommend this bag!

Even Better than Expected.Karter C.

The bag feels extremely well made. The pockets are well placed and I love the location of the shoe/used gym clothes slot on the side.

Lifetime investment

When it comes to durable, high-quality materials we don’t mess around. The Core Duffel is built to last and follow you on your lifting journey.

4.8
Rated 4.8 out of 5 stars
Based on 767 reviews
Total 5 star reviews: 665 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
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767 reviews
  • GR
    Greg R.
    Verified Buyer
    Reviewing
    CORE Duffel Mini 15L
    I recommend this product
    What type of training is your KNKG bag supporting you with? None - I don't use my bag for training
    Using For: Every Day Carry
    Rated 5 out of 5 stars
    Greg Review

    Love the mini.

    Was this helpful?
  • 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

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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 King Kong 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 12 shoes. The CORE51 (Large) will fit size 15 shoes.