I have had my 3L reservoir for over a year and have used it for my daily commute via bike and backpacking trips. It is a stable pack and has a easy to use hose and mouth piece. It functions well and gets the job done. I will say however, that when you are filling the pack with all 3 liters, it can get cumbersome to hold weight wise as well as hard to keep the mouth open to allow water in (it's almost like you need 3 hands to fill it. One to hold it up, one to hold it open, and one to turn on/off the water). Additionally, my pack was damaged when I was packing my backpacking bag and I needed to replace it. Luckily, the Osprey ALL MIGHTY GUARANTEE cover the damage and I was easily able to report the defect (via computer with pictures) and received a new pack (minus the hose and mouthpiece) within 2 days. The customer service was very fast to respond and even gave me a tracking number to track my new pack.