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

WE’RE SERIOUS ABOUT OUR GEAR

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
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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.

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 630 reviews
Total 5 star reviews: 545 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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630 reviews
  • 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.

  • 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.

  • 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.

  • 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

  • RC
    Resty C.
    Verified Buyer
    I recommend this product
    What type of training is your KNKG bag supporting you with? CrossFit, Weightlifting
    Using For: Gym Bag
    Rated 5 out of 5 stars
    KNKG

    It’s been Great since I got it!!! Been using it on my daily Gym routine yessahhh

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.