GSI H2O Lite
Here's what other sites are saying:
Lightweight design flattens and rolls neatly to stow in packs or pockets. No spill lid only dispenses when you want it to. Multi-layer laminate bottle includes rewritable date bar on front and rear to record name and fill date, convenient graduations printed on reverse. 0.5 liter capacity. 0.7 oz.
- Ramsey Outdoor