Beat the bulk of hard plastic, metal, and glass with a water carrying device that rolls up small enough to fit in your pocket when it's empty.
Vapur's Element is high capacity (23oz-32oz) and high flow. The non-leaking, locking integrated carabiner cap flips open to let you drink through a pour spout small enough that you won't spill, large enough that you don't need to suck the water out—just squeeze the bottle to get a drink.
These US manufactured bottles are dishwasher safe, and BPA-free. And, even after four months of regular drinking, rolling up, dropping, and even freezing in a ski pack, the three-ply plastic shows no wear and tear.
Stash one in your messenger bag, pack, brief case, or carry-on. When it's empty, it'll never be in your way, and because it's clear, TSA won't bug you to look inside. Available now, $12-14, vapur.us.