I gave the hydration bladder a 4 because I haven't had it for 24 hours yet. I have used it today and so far no leaks with or without pressure. I didn't experience the plastic flavor it talked about. I did follow the instructions and clean it before using it. It was very easy to clean. I love the closing lid design. It makes for easier fill up and no leaks. My last bladder was not bought from here. It leaked everywhere with and without pressure. I have already told my sister about it. Since she is harder on things than I am.Got this to replace our old ones because it's super easy to clean! Did the trick for our all day hike at Glacier Natl Park.Will fit standard day packs designed for water bladders.No dislikes. Love it use all the time for hiking and airsoft highly recommendedI purchased this for hunting and camping. It has worked really well for me and I really like the ability to quickly change the drink tube easy. So I've now bought 2 of them for me and 1 for my wife. So I highly recommend this product.Good, solid product. Soaked and washed before first use, as instructions recommended. I drain the hose, rinse out the bladder, and hang both to dry after each use. After just over a year and well over 100 hikes, this hydration bladder has held up very well. No issues with taste or odor or mildew at all. Has held up very well, no tearing, no leaks, no punctures.Received a defective bladder. The seller went above and beyond to make it right! Bladder serves its purpose and appears and feels rather durable. Highly suggest!It works as it should, no leaks in a tight backpack during a 4 day trek other than when you disconnect the hose to move it around as water is still going to be in the hose/connecting area.Purchase to replace another water bag I have. This one is one liter last but I don't use as much water for certain hunting trips. Didn't leak, mouthpiece is nice that it's angled. Happy with the item.