http://0.tqn.com/d/collegelife/1/0/u/0/-/-/SayItWithVases.jpg

Collapsible Vase's! I bought 2 at 1.50$ each cause they seem useful enough to carry water and "store it" and I say that with quotes since they do not seal shut. They Weight nothing, take no space, cost nothing and sure as heck let you transport more water then cupping your hands.