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

One race in, and I'm in love. I have that common salomon vest, and had to replace the hydrapaks. These are bigger than what I had but still fit. Running with the straws was a mixed bag - I'm still working on the best way to keep them from bouncing around while also not being pressured to my neck. The access for a quick drinky drink was amazing. These also feel thicker than the Salomon version that came with my vest. These are worth the upgrade - though, I haven't tried other brands for a true comparison.

I finally upgraded from the standard sized 500ml flasks and appreciate the extra 100ml here as well as the wider opening for refills. Has made aid station visits a lot easier on the couple long races I've used it at so far. So far, no issues with leaking or durability and it feels great in the hand - I will regularly run for many miles just carrying one of these instead of throwing them in my backpack.

These are a life saver while out hiking. The pack light when not in use and also do a good job of keeping your drinks a little cooler than some other products I've used in the past. Quality made and very durable, no leaks at all after months of use.

They fit great in my hyrdation vest, but the lack of any rigidity makes them hard to fully dry after cleaning.

I like them. Stand on the bottoms with the lids off which makes aid station refilling much easier.

These worked out amazing for our hike. We wanted extra bottles for electrolytes. They worked perfect

The flip cap will NOT stay closed! The third time I used this bottle after filling it, the "snap" closure would not click shut. Not usable.

Love this! I use this in my running vest and it works really well. Doesn’t leak and is easy to clean. The straw was too long for where I like to wear it high up on my vest but I was easily able to cut it to the perfect length for me and fit the piece back on with no issues.