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I got this in the mail yesterday. It is bigger than I expected, but that's a pleasant surprise. Other reviews stated that it was difficult to get the water bag out of the backpack. I have never owned one of these packs before, so I was worried I would have trouble removing it to clean. I am happy to say it was a piece of cake. It took me all of 15 seconds to figure out how to remove the bag and hose. I washed it out with a mild dish soap and water, and set it out to dry. Once dried, I inserted the bag and hose again without issue. The pouch is big enough to hold my phone, keys, wallet, and some snacks for the road. I will be using it this weekend while hiking, and I'm confident that I will stay well hydrated. As for all the complaints about the bite valve leaking..... I tested it several times, and so far no issues with it leaking. Even if it does start to leak, you can buy replacements for just a few dollars. Simple fix, so I'm not sure why all the fuss over it.

I specifically bought this one to use while mountain biking. Took it out yesterday and hit the trails hard. It stayed in place and didn't cause any issues while riding. The pocket is pretty darn tiny but I only wanted something big enough to fit my wallet, keys and cellphone which it does.

The water bag works well although personally I felt the hose was a little long. If you cinch the pack up to where it should be the water hose will hang down to your waist. I cut it to make it less likely to get in the way or swing up and hit me in the face.

Bite nozzle works well, no leaks. Before you use it for the first time you should remove the bag and wash it out. I don't know why people are complaining about removing the bag, it is not hard to do.
I didn't notice any lift when I was going off jumps or dropping. It moved with me
Overall it provided me with more than enough water, stored my valuables while riding and didn't get in the way. I do wish it had a chest strap but it was a good purchase.

The pack is comfortable when full or 1/2 full of water. I am a women's size 16 and found the soaker adjusted comfortably. I had a little trouble figuring out how to fill it; I had it in the sink filling it from the faucet. Faucet method made it to difficult to seat the cap ring and the bottom of the pack was wet, ugh. I saw bicyclists fill the pack from bottles of water. One could fill a saved plastic bottle from the faucet and then into the pack.
I found the mouth piece tricky to use. Despite the pack's instructions, I had to keep the mouth piece gently between my teeth to keep getting water. That is fine for drinking but difficult for taking pills.
This pack requires some thought to adjust to it but when the user finally figured it out, I could keep well hydrated.

I'd give this 5 stars but I have 3 of these and all of the bite valves leak to some extent. The pack is great otherwise and it would get 5 stars if it were not for the poorly designed bite valve. High sierra was however very helpful and mailed out new valves free of charge but I expect they will all start leaking too.

A lot of people have recommended replacing the valve with one from another company but a lot of them are the wrong size. This can be fixed by just using a zip tie to keep it in place. The zip tie is surprisingly secure.

Holds a good amount of liquid but the reason it gets three stars is because the screw on lid is very easy to cross thread/ not get seated all the way which results in spills and worse yet wet backs! We used this for a mascot at a trade show to help keep the mascot cool and hydrated which meant various people throughout the 4 days had to play with the lid. On each day there was a spill. We did like the big opening to pour ice in though! Finally the mascot never fainted so the ice helped cool and the liquid helped hydrate!

Used this on several days hiking and also on long car/tour rides. Had no problems with leaks or anything. I also filled to the brim with ice then water and had cold water the entire day. The pouch doesn't fit a ton of stuff but will fit all that you need. There are only a few mesh pockets between the bag and what you put in the pouch. If you put your phone in with an ice filled bag expect your phone to get some condensation. Other than that, great purchase, I love it and would definitely recommend.

This is an excellent product for runners, hikers, excursionist...
Light, durable, good quality.
I miss it, I left it behind in my country.

Such a good backpack, but two months in and the bite valve won't shut anymore. :( Now water drips everywhere and when you bend down it squeezes the bag and an actual jet squirts out of the bite valve.

EDIT: I contacted High Sierra and they shipped 4 valve replacements! Even though it seems like that's the weak spot of the product, customer service was nice and the rest of it is very good. I'll bump it up to 3 stars.