Good idea! I'm sure it would work and also would be a lot easier to store. The main reason I haven't done that (other than not thinking of it <img src="/forums/images/graemlins/smile.gif" alt="" /> ) is that I get the 2 liter bottles as a by-product of buying club soda, one of my favorite beverages, whereas I would have to spend real money for a Platy to behead. And, since the bottle bottom fits well on my Thermarest I wasn't too concerned with storage in the pack.