We have seen a variety of carry to work kind of bottles [Kor One, Ech2o], which encourage you to drink tap water as against packaged water since the massive amount of plastic ends up in landfills without any degradation. The reusable bottles that we have seen till now would occupy a substantial space whether filled or not. So to make life easier check out the VAPUR, the anti bottle which is a foldable water bottle that saves space by folding up and in place of just one you can carry many with you.
VAPUR is ultra-durable, FDA-approved and BPA-free. It stands upright when filled and when empty can easily collapse into a small form that can be easily carried around. Available in blue, green and pink colors the 16oz bottle is priced at $8.95.