CORE Backpack Waxed Canvas Medium 25L

4.8
Rated 4.8 out of 5 stars
4.8 Stars (255 Reviews)
$270
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TRADITIONAL WAXED CANVAS BACKPACK FOR EVERYDAY CARRY

WAXED. WEATHERED. UNCOMPROMISING.

The CORE Backpack is built tough - with a water-resistant waxed canvas exterior inspired by the rugged, resilient spirit of the West. Over time, waxed canvas develops a vintage look, picking up the marks of your journey and building character with every use.

The unique external belt attachment keeps your lifting belt secure on the outside, freeing up valuable space inside the bag. With smart storage throughout, it’s made to back you through training, travel, and everything in between.

Featuring:

  • Water-resistant Scottish waxed canvas from Halley Stevenson.
  • Genuine Cow leather logo patch and zipper pulls.
  • External weightlifting belt attachment.
  • 16” internal laptop sleeve.
  • Sealed internal shoe compartment.
  • Dual bottle pockets. 
  • Packed in a sturdy keepsake box - perfect for gifting.
  • Genuine leather wallet & keyring included - Limited time only.

(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.

KNKG bags are built to go the distance. Every piece is engineered with quality materials, precision craftsmanship, and real-world testing - so you can pack it to the brim without worrying about rips or failure.

This version of the CORE Backpack features a waxed canvas body - an ultra-durable cotton canvas impregnated with wax for water resistance. Waxed canvas develops a rugged, lived-in look over time, with marks and creases that add to its character. It delivers the same proven longevity as our ballistic materials, with a vintage feel that gets better the harder you use it.

This CORE backpack is made from:
• Water-resistant Scottish waxed canvas from Halley Stevenson (cotton, waxed finish)
• Genuine Cow leather logo patch & zipper pulls
• YKK zippers
• Ripstop nylon lining
• Nylon webbing

NOT JUST DURABLE - DEPENDABLE

Built with a water-resistant waxed canvas shell, this limited edition CORE Duffel is crafted for those who aren't afraid to roll up their sleeves and get the work done. Every crease, mark, and scuff tells the story of work put in and limits pushed. No shortcuts. No excuses. Just a bag that shows up like you do.

BUILT TO GO THE DISTANCE

Waxed canvas isn’t just for looks. It’s a proven material trusted for over a century. Water-resistant, tough by nature, and built to age with character. This isn’t a trend piece. It’s a workhorse built for the grind.
CORE BACKPACK
SIZE COMPARISON
Capacity
Bag Weight
Height (H)
Width (W)
Depth (D)
Shoe Storage
Laptop Sleeve
MINI
13 L / 3.4 GAL
0.8 kg / 1.8 lbs
35cm / 13.8"
25cm / 9.8"
15cm / 5.9"
Not recommended
iPad
MEDIUM
25 L / 6.6 GAL
1 kg / 2.2 lbs
50.8cm / 20"
30.5cm / 12"
17cm / 6.7"
Up to size 10
Up to 16"
LARGE
33 L / 8.7 GAL
1.1 kg / 2.4 lbs
53.3cm / 21"
31cm / 12.2"
20.1cm / 7.9"
Up to size 13
Up to 16"
Capacity
Bag Weight
Height (H)
Width (W)
Depth (D)
Shoe Storage
Laptop Sleeve
MINI
13 L / 3.4 GAL
0.8 kg / 1.8 lbs
35cm / 13.8"
25cm / 9.8"
15cm / 5.9"
Not recommended
iPad
MEDIUM
25 L / 6.6 GAL
1 kg / 2.2 lbs
50.8cm / 20"
30.5cm / 12"
17cm / 6.7"
Up to size 10
Up to 16"
LARGE
33 L / 8.7 GAL
1.1 kg / 2.4 lbs
53.3cm / 21"
31cm / 12.2"
20.1cm / 7.9"
Up to size 13
Up to 16"
PACKAGED WITH PURPOSE
This isn't your average unboxing. Our limited edition Waxed Canvas Collection comes packaged in a premium keepsake box — making it the perfect gift or collector’s piece.

FAQS

The main difference is the unique external weightlifting belt attachment - letting you carry your belt on the outside without sacrificing internal space. This version also features a 35L capacity and a reworked layout for streamlined storage. It's built from waxed canvas, a water-resistant cotton material that develops a rugged, vintage look with use - making it as tough as it is timeless.

This version of the CORE Backpack features a waxed canvas body - an ultra-durable cotton canvas impregnated with wax for water resistance. Waxed canvas develops a rugged, lived-in look over time, with marks and creases that add to its character. It delivers the same proven longevity as our ballistic materials, with a vintage feel that gets better the harder you use it.

Measure the widest point of your belt. The CORE25 (Medium) Backpack can fit a belt up to 5.9"/15cm wide.

And yes! Lever belts will work with this bag.

The CORE25 (Medium) Backpack fits shoes up to size 10 US mens trainers/runners comfortably.

4.8
Rated 4.8 out of 5 stars
Based on 255 reviews
Total 5 star reviews: 215 Total 4 star reviews: 30 Total 3 star reviews: 6 Total 2 star reviews: 2 Total 1 star reviews: 2
96%would recommend these products
Slide 1 selected
255 reviews
  • SN
    Scott N.
    Verified Buyer
    Reviewing
    CORE Backpack Large 33L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting
    Using For: Gym Bag, Work, Sport / Fitness, Every Day Carry
    Rated 5 out of 5 stars
    Backpack Large 33L

    Fantastic gym backpack with tons of space and smart organization. The 33L size is perfect for carrying workout gear, shoes, accessories, and everyday items without feeling bulky. The materials feel premium and durable, and it’s comfortable even when fully loaded. Great bag for the gym, travel, or daily use.

  • JS
    Jenny S.
    Verified Buyer
    Reviewing
    CORE Backpack Medium 25L
    I recommend this product
    What type of training is your KNKG bag supporting you with? CrossFit, Weightlifting, Olympic Lifting, Functional Circuit Training
    Using For: Gym Bag, Sport / Fitness
    Rated 5 out of 5 stars
    Love it

    Great Gym bag, I researched all the different kinds of gym bags out there for months. Went back and fourth for a long time if this pack was going to be worth the price tag/too big. I wanted this to be the last fricken gym bag I buy....It definitely is great quality and big enough to fit my essentials but not to big for me to get disorganized, which was why I was getting rid of my black hole of a duffle bag. The shoe compartment was one of biggest sellers for me, nice to have my swampy chaulk and protein powder sprinkled shoes not touching my inhaler, your not thinking about ring worm when your trying to breath. Exercise induced Anaphylaxis eppy pen at the ready in the front pocket , how embarrassing it would have been digging through a duffle as your eyes are swelling shut. A place for everything and everything in its place, is sometimes more important for some then others. This bag helps put my mind at ease which is why I'm at the gym in the first place.

  • FT
    Fabian T.
    Verified Buyer
    Reviewing
    CORE Backpack Medium 25L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Weightlifting, Fight & Combat Sports
    Using For: Every Day Carry
    Rated 5 out of 5 stars
    Awesome Bag

    Amazing bag, use it for school and the gym and have got to say, im very glad I made the purchase. Perfect room for everything I carry, from school stuff to my gym clothes and shoes!

  • AS
    Alfonso S. L. R.
    Verified Buyer
    Reviewing
    CORE Backpack Large 33L
    I recommend this product
    What type of training is your KNKG bag supporting you with? CrossFit
    Using For: Sport / Fitness
    Rated 5 out of 5 stars
    Perfect!

    I’d like to get informed when the medium green its available ve cause I want it!

  • JN
    Jason N.
    Verified Buyer
    Reviewing
    CORE Backpack Waxed Canvas Medium 25L
    I recommend this product
    What type of training is your KNKG bag supporting you with? Bodybuilding, Weightlifting
    Using For: Gym Bag, Sport / Fitness, Every Day Carry, Work
    Rated 5 out of 5 stars
    Only Bag I Need.

    I’ve gone through a lot of gym bags over the years, and most of them fall apart, smell terrible, or just don’t fit real lifter needs. This one surprised me. The Core KNKG waxed canvas bag feels different right away. it’s got that rugged, broken-in look like it actually belongs in a gym, not just a locker room. The material is tough but still clean-looking, and it somehow manages to look better the more you use it instead of worse. What really sold me is how functional it is without being overdesigned. Everything has a purpose. Shoes don’t stink up your clothes, smaller pockets actually hold things where you expect them, and it doesn’t turn into a black hole when you’re trying to grab something quick between sets. I run a pretty busy schedule as an early morning baker and carry a lot- lifting gear, extra clothes, sometimes even food and this bag handles it without feeling bulky or flimsy. I don’t like how big duffel bags are but this bag feels like one with the backpack functionality which is what I don’t know I needed. It’s one of those pieces of gear you don’t realize you needed until you have it. Most bags feel disposable. This one feels like it’s going to stick around for years.If you’re serious about your training and want something that matches that energy, this is it.