http://www.ebay.com/itm/New-Durable...02ba168&pid=100005&rk=3&rkt=6&sd=181713686894 These can be had for about 3 dollars. The interesting part is the thread on cap- vent the cap somehow and I think this might make a great little tank that weighs NOTHING. Theres also alloy Handlebar bottle cages on ebay for $1.50. Whole setup under five bucks! I think I may try to drill the bottom and thread in a petcock- is there a gas proof sealant out there for the threads? The bottles also come in 500ml besides this 750 (3/4 liter) one Now if they'd just give us a clutchable 33cc china girl I could slap it on a vintage Schwinn with 700 wheels and fast 28 mm narrow tires. A 35 pound bike with afterburners that peddles like a road bike!