CORE Duffel Medium 35L
OUR TOP RATED GYM DUFFEL FOR WEIGHTLIFTING
- 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.
SIZE COMPARISON
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.
FAQS
- JCJanet C.Verified BuyerReviewingCORE PRO Duffel Mini 15LI recommend this productRated 5 out of 5 starsCompact duffel
As advertised perfect for gym workout gear
- AHAllen H.Verified BuyerReviewingCORE PRO Duffel Medium 35LI recommend this productRated 5 out of 5 starsMore 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.
- PLPaul L.Verified BuyerReviewingCORE PRO Duffel Mini 15LI recommend this productRated 5 out of 5 starsGreat little bag
Great bag to take with you machine to machine if you have some attachments and grips.
- BBrianReviewingCORE Duffel Waxed Canvas Medium 35LI recommend this productRated 5 out of 5 stars5 Stars
Bag was amazing, was a little smaller than I expected so will order the large version for the gym.
- ACAlex C.Verified BuyerReviewingCORE Duffel Medium 35LI recommend this productWhat type of training is your KNKG bag supporting you with? Weightlifting, BodybuildingUsing For: Gym BagRated 5 out of 5 starsAwesome 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.
Ultimate Gym Bag with Weightlifting Belt Attachment — KNKG CORE Duffel
Built for serious lifters, the CORE Duffel is the gym bag that solves one of the biggest packing problems: cramming your lifting belt inside your bag. With its iconic external belt attachment, this duffel keeps your belt secure on the outside, saving precious space inside for the gear that matters.
Why the Weightlifting Belt Attachment Matters
Most gym bags weren’t built for people who take their weightlifting serious. Stuffing a thick lifting belt inside a bag means less room for everything else, and more time sifting around inside your bag. The CORE Duffel changes that with an external weightlifting belt sleeve designed specifically for heavy training gear:
- Save Space: Carry your belt outside and keep the interior free for other gear.
- Secure Fit: Reinforced straps hold your belt firmly in place, no slipping or sagging.
- Quick Access: Grab your belt instantly without digging through your bag mid-session.
- Proven by Lifters: Tested by athletes who lift heavy and pack large.
What Fits Inside
The CORE Duffel isn’t an everyday commuter bag — it’s designed for the gym. The interior and compartments give you space for everything you need for training:
- Weightlifting shoes or sneakers (dedicated shoe compartment)
- Change of clothes
- Shaker bottle or water bottle (dual external bottle pockets)
- Chalk container
- Knee sleeves, wrist wraps, straps
- Lifting accessories (grips, straps, bands)
- Towel
- Headphones or gym electronics
- Snacks or post-workout supplements
- Phone, wallet, and keys (secure valuables pocket)
With your lifting belt attached on the outside, the CORE Duffel has more interior space to comfortably fit everything else you need for a serious training session.
Materials & Build
Like every KNKG bag, the CORE Duffel is built to take a beating. From heavy training sessions to being tossed in the trunk or dropped on the gym floor, it’s designed to last. Reinforced stitching, abrasion-resistant fabrics, and quality hardware mean this bag doesn’t just survive hard use — it thrives on it.
- 500D nylon body material with PVC backing
- Ripstop nylon lining
- Heavy-duty YKK zippers
- Reinforced nylon webbing straps and handles
Why Choose the CORE Duffel?
- Famous and trusted external weightlifting belt attachment
- Purpose-built for lifters — not for everyday commuters, built for gym rats who take their training seriously
- Smart compartments: shoe storage, dual bottle pockets, valuables pocket
- Premium materials built to handle heavy training loads
- The gym bag that keeps your belt secure and your gear organized