YES!!! That is exactly the kind of stuff I've been looking for. And the reason for trying this versus a stock bladder is a) I'm a huge weight weenie and b) I'm a little dude, so don't have much space to give up in my frame bag. If I actually use the full volume of the bottom corner of the bag, I can fit nearly 3L in the same space that I currently fit only 1L using stock bladders, which also happens to be almost 2/3's of my bag. And, I've got a tricky little idea for water treatment that is going to make getting and treating water take less time than filling a bladder at a faucet. I know it seems silly, but every time I stop for water and treatment its usually a 5-10 minute ordeal and with a little bit of doing, I think I can cut that down to a minute or so. Add that up over a week or more... Cause we're racing...right?
Yes, you would need measurements, heat-sealable food grade plastic and a hose, perhaps with a clip on it to go on your shirt, handlebar or frame etc. Just buy plastic thick enough to limit punctures. You may need silicone sealant at the joint from bag to hose. I saw a post from one guy who ran a strong wire from one downtube waterbottle bolt hole to another on his seattube. He did this to support the bladder from getting in the way of pedalling feet and footrub. The water wants to spread the bag out and move around as you move your bike.
