Best triathlon bags in 2025: 13 options rated and reviewed

A triathlon bag (also called transition bag) may not be a mandatory purchase for your racing endeavours. In the past we’ve seen, and used, holdalls, plastic boxes and bin bags, all with varying degrees of success. But along with your tri-suit, it will be one of the most useful purchases for tri racing.

However, a triathlon-specific bag will make your life a whole lot easier, so much so that you’ll wonder how you previously survived without one.

They can also act as a badge of honour, signalling to fellow multisporters that you’re not only a triathlete in the pool, but also in the departure lounge and city centre cycle lane.

Here, we test out 13 options to find out which are best for triathletes…

1. Huub TT Bag

• $185.48 / £99.99

Huub’s stylish TT (‘transition three’) bag won our 2022 group test and, as it’s unchanged, it impresses here, too.

Key features include a 40-litre capacity, a clever mesh foldaway helmet cradle and both wet and dry sections.

The bottom wet compartment was large enough for all my soggy swim kit and kept it completely away from dry stuff.

The main bag is split into two, which meant we could easily separate our bike and run kit. Multiple small pockets are handy and you also get two mesh bottle storage areas on the sides, which is ideal for bottles.

The materials all feel top quality, while padded straps and a cushioned back panel make it comfortable.

This is a bag designed by a brand that really understands triathlon and, although roomy enough for all my kit, it wasn’t unwieldy. HW/RS

2. Orca Transition Bag

• $155 / £139

Like the Huub, this 70-litre bag feels well-constructed and offers a lot of clever storage solutions designed with triathletes in mind. A top pocket stores your bike helmet, while the bottom is wet storage for swim gear.

Meanwhile a genius section opens up to house two pairs of bike/run shoes with Velcro pop-up separators, also keeping mud off your apparel. The padded/shell helmet area is a great addition.

It’s easy to find what you’re looking for and a bright green lining helps with visibility. Two padded straps allow you to carry the bag as a rucksack, while one large strap converts it to a duffle bag.

There are multiple small pockets, too, including a padded pocket for sunnies. Overall this is a superbly-designed bag, but my only caveat was it felt a little large/heavy and unwieldy for this 5ft6in (168cm) tall female tester. HW

3. Huub Travel Backpack

• £99.99 (GBP only)

Huub has designed the Travel Backpack to strike a balance between a work pack and a transition bag. Given its 24-litre capacity and slimline design, I was dubious about how well it’d live up to the second half of that promise, but I was pleasantly surprised.

 In a tardis-like stroke of magic, I pretty much managed to fit everything into this pack for race day. That includes a wetsuit, towel, goggles, (size 11) bike shoes, energy gels, swim cap, water bottle and helmet (strapped to the outside). 

There’s then some leftover space for things like extra socks, a jumper and race documents. I’d be hard-pushed to squeeze run shoes in there with everything else, but I’m normally wearing them on my feet when going to a race, anyway.

That storage is arranged cleverly, too. There’s a separate compartment at the bottom (accessed from the side) for dirty shoes or a wetsuit, though it’s not waterproof. 

A main compartment is accessed via a clamshell-style zip that opens the whole front section, which makes it easy to load and grab things. Inside, there are further zip pockets for small items like nutrition, swim caps and other small bits. 

There’s one elasticated side pocket that’ll take a bidon, but any extra ones will have to go inside the bag. A mesh helmet holder slips out of its own pocket at the bottom and clips your lid in securely on the front of the pack.

On the travel/work side of things, you’ve got a spacious laptop compartment down the back and rear straps that allow you to slide the pack onto a suitcase handle. 

Carry comfort is reasonable over shorter distances, but prepare to get a sweaty back if it’s hot. 

The pack would work well when travelling to overseas (or UK) races, but look elsewhere if you need more space, want a waterproof wetsuit compartment or extra bottle storage. RS

4. Zone3 Transition

• $150 / £79

We’ve tested this pack several times in the past and have always been impressed.

A key feature here is the division of the main compartment, enhancing race-day convenience because of the ability to file swim, bike and run kit into different areas (swim kit is stored in the waterproof compartment at the bottom).

The middle section’s ability to open out also makes it adept for lying flat on pool benches or in transition.

There’s a selection of additional zipped mesh pockets throughout the inside of the bag, allowing you to file each bit of kit into its own space.

Additional neat touches include a phone pocket with earphone outlet, side mesh pockets for water bottles, the ability to stand the bag up and a reinforced lid for helmet protection. RS/MB

5. KitBrix Hero Bag

• $129 / £99.90 (per brick)

KitBrix’s modular design allows you to create a storage solution to suit your needs, as each 20-litre bag can be zipped up together. They are rather expensive, though, particularly if you want a few.

One bag on its own is certainly not going to provide enough space for all of your tri kit, but two together would prove sufficient.

The modular design would also mean you can easily keep wet or dirty kit in one bag and dry kit in another, while a variety of internal zip pockets and external mesh pouches provide storage solutions for race admin and smaller items.

The bag is robust in its construction, offering good protection against the elements, but the zip isn’t the smoothest and the bags aren’t the most comfortable to carry, either. There’s a shoulder strap, but the boxy design makes it feel bulky and awkward. RS

6. Compressport GlobeRacer Bag

• $190 / £140

At $190/£140, the 35L GlobeRacer is one of the more expensive bags tested here. It opens like a clamshell, with a large pocket on one side, while the other side is split into two.

The largest pocket also contains a detachable ‘dry bag’, though it’s not fully waterproof, so isn’t ideal for wet swim kit.

There was just enough space for me to fit all my race-day kit inside, but you can also slide your helmet into an elasticated pouch on the front if preferred.

Other storage options include two small elasticated pouches on the front, though we’d prefer zipped pockets for security.

My cycling bottles just managed to squeeze into the side mesh pockets, while the bag’s outer fabric is water resistant, which is a bonus, but it won’t keep your kit dry in heavy, sustained downpours. The finishing didn’t quite match the price, either. RS

7. Thule RoundTrip Bike Duffel

• $159.95 / £109.99

Like the Castelli Pro Race Rain Bag also tested here, the RoundTrip is aimed primarily at cyclists, but it also does a decent job for triathletes.

It takes the shape of a (rather large) duffel bag, so there are no shoulder straps here. Instead, there’s one sling-style strap.

One end of the bag has a shoe compartment, though it’s large enough to take a wetsuit and uses water-resistant materials, plus has drainage holes. Of course, this does mean it’s not entirely waterproof.

There are also two zip pockets on the side that’ll take all of your small items. Inside the main compartment there’s a network of partitions for you to store items.

This web of storage spaces is a nice idea, but it does make it difficult to fit both bike and run shoes in alongside your helmet. If you have considerably smaller feet than I do (UK11), this might be easy for you.

You can fold the structure away, but you’re then left with one big space to work with, which isn’t ideal. Plus, the folded away structure will take up a little bit of space (you can’t fully unclip it and take it away, as it’s stitched in at one side.

At one end, there’s also space for a helmet, with padding on the outer for protection, which is great to see.

As we’ve come to expect from Thule, the build quality is exceptional. RS

8. Castelli Pro Race Rain Bag

• $139.99 / £150

This Castelli bag is very much aimed at cyclists rather than triathletes, and it shows.

For a start, there’s no dedicated wet storage area. Instead, you get multiple compartments for different items of clothing, plus a compartment for shoes, though this is only large enough for one pair.

The organisation of clothing is handy, but it’s unlikely to suit most triathletes on race day.

You should be able to fit a lot of kit into the bag, but I was left having to carry a pair of shoes and my helmet, and I needed to pop my wet kit into a dry bag before storing it away. 

On a more positive note, the separate shoe compartment is detachable, as is one end of the bag, allowing you to carry a few essentials with you rather than the whole thing.

While it’d be great for bike trips, this just isn’t quite right for multisporters, and the price is pretty steep too.

9. Castelli Gear Duffle Bag 2

• $109.99 / £100

Castelli has designed this bag as ‘an overflow bag for a three-week stage race’, but there’s a lot to like for triathletes here, too.

The 50-litre capacity is roomy enough to get all your gear in and has a handy wide opening zip.

But like the Under Armour, most of that room is in one large single duffel area. The red lining helps with inner visibility, though, and there’s a massive mucky shoes area which can be used for wet kit.

However, it lacks the impermeable nature of more swim/tri-specific bags. In addition, there’s one zippy external pocket and a mix of internal mesh stuff pockets.

That price tag is a stumbling block for such a simple item, though, especially when you can get the equivalent size (medium) version of the Under Armour on test here (58-litre) for much less. HW

10. Under Armour Undeniable Duffle 4.0 XL

• $70 / £55

The XL version of Under Armour’s duffle bag is absolutely huge, with a 145-litre capacity. Smaller sizes are available, which is a plus, as if you compare the bag volume needed by a petite athlete with a small shoe size to a larger athlete, it makes sense to offer a range.

This is more of a gym bag than a triathlon bag, but if you don’t want the varied pockets of some of the more complex bags on test, it may be an attractive option. The bag is water resistant, has two large zip-down front pockets and one soft inner pocket (though this only has a flap closure).

There’s a separate storage area for mucky shoes, which you could use for swim kit, but it has no waterproof lining. The price point is good for a massive bag, though it only has a hand or single shoulder strap and can’t be carried as a rucksack. HW

11. OMM RaceBase Cargo 70

• £90 (Europe only)

Here we have another bag that’s like a duffel in style and function. This option from OMM comes with a 70-litre capacity, which is plenty of room for you to fit all of your kit in.

To be honest, it’s probably overkill for most triathletes. The result is that it can be tough to sufficiently pack the bag in a way that stops your precious kit sliding and banging around.

One thing I was pleased to see, though, is a separate compartment dedicated entirely to wet or dirty kit, which worked well.

This proved big enough to take a damp men’s wetsuit in size medium, with room to spare.

That being said, I was disappointed to see only one, zipped mesh pocket in the lid, meaning there’s limited options for storing and organising smaller items. The outer is durable and sheds water well. RS

12. Topeak PakGo GearPack

• $189.99 / £129.99

The GearPack is cube-shaped with shell sides and a flexible middle so it can be packed small to store/stash away (handy if your transition has size limits), but then pulls out to create a kind of portable kit locker.

With three main sections comprising a mucky shoes storage area, bike helmet section and apparel section, it’s nicely divided up for athletes.

There are then six additional pockets for smaller items. There’s also a twin strap that can be clipped on to turn it into a rucksack, which is handy if you need your hands free.

At a max capacity of 38 litres it’s among the smaller on test, but an external helmet clip frees up the internal pocket.

One extra nifty feature is the two sides also fold down, allowing you to use the central area for storage and the two sides to neatly lay your gear out on. HW

13. Zoot Ultra Tri Bag

• $160 / £145

The canvas fabric makes the Ultra Tri stand out from much of the competition and, the bulbous protective helmet compartment aside, it ticks the aesthetic boxes.

It also ticks race-day boxes, with an internal checklist of race items, secure bottle storage, multiple mesh pockets, and a sizeable and removable dry bag for wet kit. It opens out fully – suitcase style – which is a huge bonus for overseas multisport adventures.

The comfy straps and ergonomic back panels also make it ideal for long journeys. Being 42-litre and 62cm (24.4 inches) tall could cause issues with the more draconian of airline staff.

The lack of suitability for commuting and pool or gym sessions is also worth noting. MB

What to look for in the best triathlon bags

A designated waterproof wetsuit compartment – whether built-in or removable – is ideal for any race involving open-water swimming, preventing your kit and car boot from becoming a soggy mess post-race.

Separate pockets for race fuel, admin (entry forms and race licence), tools and water bottles are highly recommended, while comfy straps are ideal for the often long walk (hello Windsor Triathlon) from the race car park to the transition area.

Also, try to remember that a transition bag doesn’t have to be just for race day, with many of those on test here being versatile enough to use for commuting, the gym and swim sessions.

And it’s worth noting airlines’ cabin bag limits if you have international ventures planned post-coronavirus. These vary from airline to airline and seem to be shrinking, meaning some of the bags tested here could be destined for the hold, which will incur extra charges.

• For more triathlon race-day gear, check out our tried and tested transition kit recommendations.