Aloksaks

These are zip lock bags made from especially thick plastic with a special seal that guarantees waterproofness (and odor-proofness). They are good for separating clothing and food for camping and traveling. We keep everything from socks and underwear to cameras and passports in them. In monsoon season in Vietnam they held up quite well and kept our gear dry and tidy.

Aloksaks
$5+ (various sizes)
Manufactured by Watchful Eye Designs

Available from Amazon