PACELids are a replacement lid for many of the common wide mouth water bottles on the market like Nalgene (and similar), Klean Kanteen, and more. In addition to keeping your water where it belongs, they also have a watertight storage compartment. This compartment can be used to store whatever you want – first aid items, survival kit items, snacks, water purification tablets, or anything else that fits.
If you are already carrying a compatible water bottle (or two), PACELid could be a great way to organize smaller items that would otherwise be knocking around in your pack.