Inside each pocket there is a heavy duty waterproof roll top bag designed to keep the contents safe and dry. On the outside of each pocket there is and expandable flap that allows for additional storage outside of the waterproof inner bags. There is also a 1.5L waterproof bottle holder sewn in to the bottom edge of each pocket, giving lots of storage options. I also have a repair kit consisting of some fabrick for patching and spare buckles. Feel free to ask any questions and I will do my best to answer as soon as possible.