HydraPak PocketFlask 500ml - Compressible, Low Profile Soft Flask Water Bottle, Ideal Fit for Run Belts and Form Fitting Pockets with Locking Cap (500ml / 17oz)

Leakproof, easy to clean, and great quality. Fits in my running belt well. Love it.

This holds quite a bit of my energy gel. I store it in my back pocket of my jersey while cycling and its easy to grab and use while still pedaling. The flask wall is thick enough I don’t worry about puncturing it and it hasn’t leaked yet from the lid. My only problem with this is I still have yet to figure out how to easily open and squeeze out the gel. The lid has a dial that goes from open to close easy enough but the plunger at the tip is difficult to open. Overall, this is a great item for what i use it for.

Like other runners, I have countless water flasks, Camelbak, Hydrapak’s various models (including their easy fill version, hand-held version, etc).This new design is low/thin profile which is perfect for fitting two flasks into a Naked belt. That combo is great for trail running. And also good for road marathons - I’d rather skip the busy aid stations.The lock mechanism is a huge plus. When you put other bottles in a belt, pressure always squeezes the drinking valves causing annoying leaks. That doesn’t happen on this new design.The only compromise is that the bottle opening for refilling is considerable smaller. I have done a road race with these yet. So can’t speak to how fast/slow refilling would be from a typical water jug at a road race.

Bought this and took it out for a test the next day. Constantly dripping from the cap. I tried to tighted, nope. I tried to take the cap off and realign, nope. Bite value is good, cap is garbage. 1st use and never worked properly.

Fits my patagonia endless run shorts pocket as hoped.

Fits in my handheld and works exactly as it should.

I'm a big fan of HydraPak and have tons of their products, but this one was a bit of a miss for me. It works as advertised and the locking cap is nifty, but I haven't experienced any practical upside to this versus just using a regular 500ml flask. Basically anywhere I can stuff this, I can also stuff a regular 500ml flask, but a regular 500ml flask can fit in places where this can't. With 42mm locking caps available, I just don't see any reason to pick this as the tradeoff for the smaller opening just isn't worth it.

Works perfectly for tucking into a waist pack. Locking feature is very nice. I wish the way the lock turns matches how it is twisted on the flask. Lock and tightening the cap are 2 different directions