I have been using camelbacks professionally, and for civilian use the far less expensive "Source"
Camelback is for those with loads of money, and an awkward idea of how "good" filling of the bottle should be.
"Source" is a medical grade plastic bag, holding 1½, 2 or 3 litres. I think you can get them with even more volume. Tubing is medical grade aswell.
The tube is fastened at the bottom, on a sturdy-looking tap. Newer models have a "quick-change" hoselock, much like on a waterhose, only with a lock on it, in metal.
The closure of the bag is like a patent-pharmacists bag, almost like a zip-lock, where you fold the bag over a plastic-pin, and then pull a handle/clamp-thingy over it.
Had my 2 litre source almost 5 years now, and i have not been careful at all with it. In fact i tend to strap it under the lid and put extra pressure on it.
Not to mention the buttons and zip-locks scurring on it there.
Still appears as if it was new, and that to a very affordable price, compared to other makes.
