Kitstarter is a treasure chest of innovation and great ideas (and the occasional junk). One the treasures is this ideas by Stash which incorporates a waterproof pocket in a pair os shorts for safe and dry keeping of your gear. Perfect for next summer since if the project is successful shipping date is planned for this December.
The idea is really simple and straight forward. Just take the bladder off a Camelback hydration backpack and stitch it back on the pocket of you shorts.