By Delta Do — Founder, IronBackpack · Last updated: October 2026
Quick answer: The best gym duffel bag for most people is 40L to 60L with a separate pocket for shoes or wet kit. On a budget, the Under Armour Undeniable 5.0 ($45, 40L, vented pocket) or Nike Brasilia 9.5 ($47, 60L) cover it. If you also carry it on your back, pick one with backpack straps, such as the IronBackpack 50L Training Duffle ($149.95).
In this guide:
A duffel is the classic gym bag: one wide opening, carried by hand or over a shoulder. In the UK it is called a holdall. Same bag, same job. The difference between a good one and a bad one is where the dirty shoes go and whether your shoulder survives the walk from the car park.
We make one of the duffels below. Every spec comes from the brand or an authorized retailer, checked in October 2026.
The comparison table
| Duffel | Capacity | Price | Shoe or wet storage | Backpack straps |
|---|---|---|---|---|
| Under Armour Undeniable 5.0 Small | 40L | $45 | Large vented pocket | No |
| adidas Defender IV Medium | Not published | $45 | Not listed | No |
| Nike Brasilia 9.5 Medium | 60L | $47 | Zippered inner pocket for dirty items | No |
| Vooray Burner Gym | 23L | $55 | Ventilated shoe pocket | No |
| Béis Sport Duffle | 23.5L | $98 | Separate "dirt bag" included | No |
| The North Face Base Camp Duffel S | 50L | $128.95 list | Not listed | Yes, detachable |
| IronBackpack 50L Training Duffle | 50L | $149.95 | Shoe compartment up to men's US 14 + waterproof pocket | Yes, hidden |
| Patagonia Black Hole Duffel 40L | 40L | $165 | None | Yes, removable |
Prices as listed by the brand or an authorized retailer in October 2026. The North Face price is the list price shown by a retailer that had it on sale. Prices change.
How to choose a gym duffel
1. Size it to your locker and your kit
| Duffel size | Fits | Watch out for |
|---|---|---|
| 20L to 30L | One pair of shoes, towel, shirt, bottle | No room for a belt or a second pair |
| 40L to 50L | Shoes, clothes, belt, sleeves, toiletries | Long duffels may not fit a 12"-wide locker |
| 60L and up | Two pairs of shoes, foam roller, team kit | Heavy on one shoulder when full |
A common double-tier gym locker compartment is 12" wide, 15" deep and 30" high. A 21" to 22" duffel goes in upright. A 29" duffel like ours does not fit a half locker unless it is half empty. Measure your gym's lockers before you buy long.
2. Decide where the shoes go
Three options, in order of how well they keep clean clothes clean:
- A separate shoe compartment with its own zipper.
- A vented pocket, which lets moisture out but shares a wall with the main space.
- A shoe bag inside the main compartment. Works in any duffel. Washable, which a sewn-in pocket is not.
For the full breakdown, read gym bag with wet/dry compartment.
3. Check the carry
A full duffel with shoes, a belt and clothes is heavy, and on one shoulder strap the whole load sits on one side of your body. If the walk from car or train to the gym is longer than a few minutes, backpack straps are worth paying for.
The duffels, one by one
Under Armour Undeniable 5.0 Small — $45
40L, 21.7" × 10.6" × 10.1" when full. 100% polyester with a water-repellent finish, foam-lined bottom and side panels, and a large vented pocket for laundry or shoes. A Medium size exists. Best for: the lowest price with shoe separation.
adidas Defender IV Medium — $45
A water-resistant base and zippered pockets for small items. adidas does not publish liters for this size on the pages we checked, and no shoe pocket is listed. adidas offers space on the ends for a team name or logo. Best for: a simple team bag.
Nike Brasilia 9.5 Medium — $47
60L for under $50. A zippered inner compartment for dirty shoes and sweaty clothes, a coated bottom and a detachable shoulder strap. No dedicated shoe compartment. Best for: the most liters per dollar.
Vooray Burner Gym — $55
23L with a ventilated shoe pocket and a water-resistant base. Fits one pair of shoes and a change of clothes, not a lifting belt and sleeves as well. Best for: a short session with light kit.
Béis Sport Duffle — $98
23.5L, 17.3" × 9.8" × 8.8", nylon body, spot clean only. A separate "dirt bag" carries shoes and used clothes. Best for: a bag that doubles as a weekend bag.
The North Face Base Camp Duffel S — $128.95 list
50L, 21" × 13" × 13", about 2 lb 10 oz. Heavy laminated body, a 840D ballistic nylon base per the retailer listing, and detachable shoulder straps. Built for travel, not for separating gym kit. Best for: rough handling and trips.
IronBackpack 50L Training Duffle — $149.95
50L, 29" × 11" × 13.4". A shoe compartment that fits up to men's US 14, a waterproof inner pocket, a 14" laptop pocket, inner mesh pockets, MOLLE webbing and hook-and-loop panels with three patches in the box. Hidden padded backpack straps zip away when you want a plain duffel. Best for: a long walk from the car with a full lifting kit.
Patagonia Black Hole Duffel 40L — $165
19.7" × 12.5" × 8.5", recycled ripstop with a TPU-film laminate, removable backpack straps, and a stated fit for most airline carry-on limits. No shoe or wet storage. Best for: travel in bad weather.
Where our duffle loses
- Length. At 29", it is too long for most carry-on limits and for a half locker when full.
- Price. Three duffels here cost under $50.
- No vented shoe pocket. The shoe compartment is closed. Take shoes out to dry at home.
- Weight. MOLLE webbing, panels and backpack straps add weight a plain polyester duffel does not carry.
Duffel or backpack?
If you drive, a duffel is faster to load. If you walk, ride or go to work after training, a backpack carries better. A duffel with hidden backpack straps covers both, at the cost of weight. For the backpack side of the decision, read best gym bags and 45L backpack vs 50L duffle. Buying a 50L specifically? See the 50L duffle bag buying guide.
FAQ
What is the best gym duffel bag?
For most people, a 40 to 60 liter duffel with a separate place for shoes or wet kit. The Under Armour Undeniable 5.0 at $45 has a vented shoe pocket, and the Nike Brasilia 9.5 gives 60 liters for $47. If you also want to carry it as a backpack, the IronBackpack 50L Training Duffle at $149.95 has hidden straps.
What is a gym holdall?
A holdall is the British name for a duffel bag: a soft bag with one wide zippered opening, carry handles and usually a shoulder strap. A gym holdall is the same thing sized for training kit. When people search for the best gym holdall, they are comparing the same bags Americans call gym duffels.
What size duffel bag is good for the gym?
40 to 50 liters fits shoes, clothes, a towel, a lifting belt and sleeves. 20 to 30 liters fits one pair of shoes and a change of clothes only. 60 liters and up suits two pairs of shoes or team kit. Check your locker too: a common compartment is 12 inches wide and 30 inches high.
Do gym duffel bags fit in lockers?
Many do, if you check length against the locker. A common double-tier compartment measures 12 by 15 by 30 inches, so a 21 to 22 inch duffel stands upright inside. A 29 inch duffel only fits when it is partly empty. Gyms vary, so measure the locker before buying a long duffel.
Is a duffel bag or a backpack better for the gym?
A duffel is better if you drive and want one wide opening for bulky kit. A backpack is better if you walk, cycle or go to work after training, because it sits on both shoulders. Duffels with backpack straps, like the IronBackpack 50L or Patagonia Black Hole, do both but weigh more.
Can a gym duffel bag be a carry-on?
Some can. The Patagonia Black Hole 40L at 19.7 by 12.5 by 8.5 inches fits the common 22 by 14 by 9 inch limit. The IronBackpack 50L at 29 inches long does not. Soft duffels compress, but airlines measure length, width and depth, so check your carrier before you fly.
Sources
- UA Undeniable 5.0 Small Duffle, Under Armour, checked October 2026
- Defender IV Medium Duffel, adidas and Academy Sports listing, checked October 2026
- Nike duffel bags, Nike.com and Brasilia 9.5 Medium details, Team Town Sports, checked October 2026
- Vooray Burner Gym Duffel, Fit2Run and Altitude Sports listing, checked October 2026
- The Sport Duffle, Béis, checked October 2026
- The North Face Base Camp Duffel S, Good Sports, checked October 2026
- Black Hole Duffel 40L, Patagonia, checked October 2026
- Salsbury double tier standard metal locker, Lockers.com, compartment dimensions
One duffel. Three ways to carry it.
Shop the 50L Training Duffle · See all duffle bags
