I use a Jandd tubular bag. Definitely longer than a Coke can, it is similar to the Cannondale one previously posted. It easily holds a tubular folded over twice. It would would be tough fit fit 2 in there as described in their website:
http://www.jandd.com/detail.asp?PRODUCT_ID=FTBII
Last edited by jonsan; 10-11-11 at 11:01 AM.