MyBandAtacama Ultra Hydration Soft Flask - Running Water Bottle - 750ml/25oz Capacity - Leak Proof Collapsible Bottles – Food Grade TPU Material - Wide Cap Opening & Straw Cleaner - Pack of 2

Have used these for Massanutten 100 and a UTMB 100K in Spain after extensive testing in training. They are perfect. The extra 5 oz versus all of the other brands is simply huge. You have to be mindful to screw it on flat from the start, but if I do there are zero leaks. LOVE the clear plastic cover for the spout, not only for hygiene, but I can loop that around my pinkie when it is off so that I can pour my electrolyte mix into the bottle and not lose the top. The opening IS wide enough to do that, at least with Roctane mix and Naak, though I would be fine if it were a few mm wider still) I did buy some velcro straps on Amazon to stabilize the top of them, as they do go a bit too high for both my Nathan and UD Hydration packs; and this has been a perfect solution and keeps them so stable. (Envisioned re-usable cinch straps, 1.5" X 12" work for me and prevent any bounce at all) These don't even leak when the spout is pulled up, so it's nice to not have to keep pushing it back down and to have another layer of security. Just don't pull up on it too hard, can pop out but don't worry, you can get it back in. Zero cons to this product. It's truly crazy that all the big hydration and trail running companies have nothing to compete with this gem! Will buy more soon.

Had to bite much harder than other bite valves. I wanted to like these water bottles and I tried them several times, but the bite valve is weird, small and uncomfortable. They work though, and didn’t leak.

Finally a soft water bottle that’s 750ml! This fits perfectly in the front pouch of my hydration backpack and is actually leakproof. So many bottles say they are and I’m always disappointed. The video instructions were super helpful, too. Love that there‘s two different ways to use it. I use the straw lid when I’m hiking, and the other lid when I’m playing tennis (it also fits way better in my tennis bag and collapses down when I’m done- way better than my bulky water bottle). I highly recommend this.

I’ve used most bottles available, these are hands down the best I’ve used. The flat bottom and large opening make these incredibly practical. Also if you use any products like nunn or anything that is fizzy it won’t bubble over.

Box arrived crushed. Bad tape job. BUT ended up really nice & lightweight. Fits perfectly in 750ml bottle holder for my shoulder strap. For the person who had trouble with the valve. The black portion pops up & down to prevent leakage. Try that.

I really like this bottle. I have a number of different water bottles that I use mainly for trail running and this bottle is at the top. I’ve struggled with finding bottles that are soft (bottle bottle style) and also carry a good amount of liquid for longer runs. This bottle has fixed that problem for me.Most soft bottles max out at 500ml, and this one carries 750ml. I have other bottles that carry just as much, but they are a hard bottle style and can cause hot spots on my skin due to them rubbing when they are in my running vest. This bottle also comes with two different drinking lids, with one having a straw that is adjustable up and down to help find that sweet spot that allows you hydrate on the move without having to remove it from your vest.The bottle itself seems to be made of a soft durable material that will withstand normal abuse that goes hand in hand with hiking and trail running. I also enjoy the shape of this bottle (cylinder) which allows you to carry it in your hand if you choose to, this is something you don’t get with most soft bottles that are flat most of the time.I’m really stoked to add this bottle to my bag and I’ll be sure to have it with me during all my long runs and my next ultra race.

This bottle works well for hydration during walking, hiking and biking.  I like that it collapses to pocket size when empty and it doesn't leak.  The wide opening for refilling is helpful.

I purchased this product for my backpacking trips and was able to take it out last weekend. My initial thought was to just store clean water from my water filter, but quickly figured out how easy it was to scoop from streams with the wide opening. For the three day trip I used it for my dirty water bottle and it worked so well. I usually was using “smart water” bottles which always do take up some room. With this I just fill, filter, and easily pack away. I will be buying one more for clean water. I loved everything about the product and will be recommending it to anyone looking to have more packability.