Hydrapak UltraFlask Collapsible Soft Water Bottle For Hydration Pack Review

Used these a handful of times now and I am a big fan! The opening is big enough to add some ice, it also makes it easy to add powdered drink mix for your preferred supplement or sports drink. I have used several other brands and they all imparted some kind of plastic-y taste on my drink - BUT NOT THESE!I love that they have the regular caps as well as straws, I often carry one on a shorter run and use the regular cap; on a longer run I will carry 2 in my running vest and the straws keep me from

I bought these specifically for the caps w/ straws, unfortunately these two caps leak when minimal pressure is applied to the vessel. Other than that the bottles are fantastic. I have many other SoftFlask models so it’s super disappointing these ones don’t work for the purpose for which I purchased.

I got two of these based on a suggestion from a friend. Was excited to use them on upcoming 50k race and 40 mile runs. However, the straw (extended) top on one unit is extremely difficult to get on the bottle and doesn’t hold water without leaking badly (all over my chest while in my vest) and both tops are hard to get back on. Nothing like struggling to get the cap on a filled water bottle at an aid station during a race when you’re cold and tired and trying to keep moving. Very disappointing.

I bought this flask for my Black Diamond Distance 8 running pack for my longer trail runs. The BD flasks are always sold out so I bought this instead and have no regrets. It fits perfectly in the upper vest pocket, there was no chemical taste, and I have had no issues with any leaking or sloshing. The extra lid with the long straw is a really nice added bonus as well. If you're in the market for a soft flask, I would recommend this product.

One leaked immediately so I could only use one. I like the one that works-I use it regularly for running. Thanks for attention!

They were a great price, but I guess you get what you pay for. No matter how I screwed and tightened the caps, they leaked everywhere. Not the end of the world, but not something I am looking for in a product. I bought these as a second set to have for easy refill/handoffs for my races. Will go back to the purchasing a second set of the default ones that came with my vest.

I can't get it to sit in my Nathan Hydration vest front pocket if it is full. If I only fill it half way it works and really for 5 miles or less that is all I need. I just use the bladder for my longer runs. Oh and the bite valve is easy to use.

Worked as expected initially but got a hole in the flask itself after just a couple uses (very gentle - sitting in a hydration pack pocket).

I bought this flask to mix tailwind (a powdered supplement) during really long rides. It packs to nothing and I put it in my hydration pack. Doesn't leak and is very convenient. However, when I fill it with just regular water it tastes a bit plasticy even after a few washes. Overall, I still think it's a great product.

I've used these as water containers, and as lotion storage options for travel. As the liquids are used up, the item can be squished into small spaces. No leakage noticed, if the tops are screwed on firmly. The bite valve doesn't leak either.

These are great and work flawlessly. I just wish I could get them in 1 liter size. Easy to fill, easy to drink from. Thanks for attention.

Idea is great because it fits perfectly in my pack but it leaks out all the water if it gets flipped upside down. A mess if I decide to take off my pack.Waste of money

Got this for my Son-in-law who does a LOT of mountain climbing. He loved it. Said it worked perfectly and fit right in with the rest of his long hike equipment.

Planning on using this for skiing. It's nice not to have to take your gloves off to get to a water bottle, or worry about dropping the lid on the lift. Fits in my front pocket, then just grab the straw and sip!

I ordered this as extra bottles for my existing vest. It was recommended as a good fit. It's a really tight fit but it does work, just not as well as I expected.

I've tried a variety of flask and these ones are by far the best. For me is important that they are easy to open and close with gloves and that there is no leakage.

These are great flasks. The product is very durable and light weight. The bite valves work great and do not leak. I use them in the front pockets of an osprey dyna 6 vest, which is very comfortable. You can roll up the bottom of the flask to make it shorter as well. To dry just turn upside down, it stands up and drains out any remaining water.

Edit: My bottle did wind up taking on an aftertaste from putting Nuun tablets in it, but not a deal breaker.This product has far surpassed all my expectations! I don’t mind the plastic taste of reservoirs too much, but I am pleased to say this one does not have any sort of weird aftertaste. It doesn’t leak, it is easy to clean, and the straw lid is amazing for not having to take the bottle out of my pack! I have the Camelbak Ultra Pro vest and the 17oz bottle fits great in the larger front…

These are amazing replacement soft flasks for my trail run vest. SUPER high quality. Wide mouth and totally leak free so far.

Love these flasks but wanted to just warn people that the tops come open VERY easily! I used them at my last Ultra trail race and twice I ended up with liquid all over me because the tops had come open as I put them into my hydration vest pocket. Otherwise, love them and would recommend them. Just be careful when putting them into your vest pockets.