HydraPak UltraFlask Speed (500ml or 600ml) - Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap

Lightweight, excellent sealing, and slim.Well shaped, fits into my running vest (I use Nathan) and even in pants with large pockets.It's a very functional hydration solution (I don't use the long straw), and I use it daily

Bought these to put in my vest for training for a marathon. I love how light weight they are and easy to refill! Awesome that I can put them in the dishwasher and not worry about left over taste from electrolyte tabs.Because they are so flexible, a vacuum is created as you drink from them. So at first when the bottle is full, it can stand on its own. After the first sip, the water stays at the top of the bottle in the mouthpiece and the bottom of the bottle starts to curl upwards and suck into itself and it can no longer stand on its own *unless* you blow air back into the bottle to give it shape again. Completely empty, it lays flat on itself and is quite small. See pictures! Some reviewers were mad about this feature but that is how they were designed- to be slim and lightweight for exercise vests/belts, not for carrying by hand and resting on tables.Looking at buying more in different sizes!

Fabulous soft flasks. The “speed” option is nice for quick transitions in races. Durable. The 600ml is a nice size & allows a bit more room for liquids over the 500ml option, while still being super compact-able when empty. The 600ml fits well into storage pockets on a number of hydration vests.

Hard to beat these for a 500mL option. Cap usually stays shut and is super nice for filling and adding things quickly. No durability questions with the price tag but still rather expensive compared to other options.

I used these as a replacement for flasks I received in a running vest. The original flasks started to leak and were hard to clean. These are much better quality and they clean well. With the old flasks, there was residue I had a hard time cleaning. These wash out and dry easily. They are easy to fill and drink from.

I am an ultra runner and have just started adding these soft flasks to my packs for longer runs to hold electrolytes or other liquid fuel so I can keep my water bladder with just water. I like how they collapse with use so you are left with a lightweight small footprint of a product. Super easy to refill with the hinged lid (SO much better than trying to fill a smaller spout area). I love that the mouthpieces are interchangeable. I really like the straw but my current running vest sits too high to use the straws and they keep bouncing into my jaw or side of my face, so I am just using the mouthpiece. They are easy to clean, have no odor or taste, and made of quality material. I highly recommend over others on the market

Great for the price, top rack dishwasher safe!

I just received two of these after tearing one of my old ones and am saddened to see that they are SMALLER than the previous 500 mL bottles. It's going to affect the osmolarity of my drink mix and I find it quite annoying that the product isn't consistent. Very disappointed. UPDATE: Dropping to 1 star because they also leaked everywhere even though the top was firmly in place. Complete waste of money.

Perfeito. Não vaza, é muito prático para misturar algum pó, e o mais importante, limpeza fácil porque a abertura é ampla. Dá pra limpar com qualquer escova.

Awesome item. Nice it can be fold to keep it small in the bag. Two thumbs.Thanks very much to the amazon driver. He knows what time he comes at our place. Two thumbs up! High recommendations for all customers here in edmonton

I love these flasks. The speed cap works really well and doesn’t leak. The only issue I have is that other reviews said they fit the salamon adv. while they do, they are very difficult to squish into the holders. I would have gotten the 500ml ones if I had known the difficulty with fit.

Muy comodos, los popotes excelentes

Tolles praktisches Produkt. Riecht nicht, ist kompakt, gut zu reinigen, schnelle Lieferung. PerfektVielen Dank