Self-supported camping I tend to use a combination of Smart Water bottles, and Sawyer/Evernew bladders since they all use the same cap threads and are only an 1-2oz in 1-2L sizes. Water is usually plentiful for me, so bladders tend to stay rolled up most of the day, and are filled just before wild camping (for shower, dinner, B'fast).

If I had to carry all my water through desert riding, then the MSR dromedaries are bomb-proof, but mine do impart a plastic taste to the water... not sure if they've fixed that, mine are rather old. Nalgene Cantene bladders (96oz size) are another favorite as I've always found wide-mouths easier to live with (fill/clean/dry) and totally trust their caps for being leakproof. However, all these lightweight plastic bladders eventually fail - they all develop permanent creases somewhere that eventually delaminates the layers and results in leaking.