The Coleman Expandable Water Carrier definitely has some flaws. With so many other alternative water carriers on the market, Coleman needs to do some revisions to their design. Although it is light (without water), and collapsible for easy storage, when filled it is awkward to carry. With the light material it moves and shifts and causes balance to be thrown off while walking with the carrier. Its cube shape also makes it difficult to carry close to you without bumping into you n at every step. It also has a tendency to "roll around" on a flat surface making it unstable until about one third...