The best deal (cheap, light, and sturdy) for recycled canteens is an electrolyte replacement drink bottle (Gatorade or similar). If you are carrying large quantities, two gallons or more, the collapsible feature of Platypus bags is important. On the other hand, in cactus and mesquite country, rigid plastic or metal is worthwhile. I keep a variety of containers around.

In the old days, we would rinse out a gallon Clorox jug and use that for carrying large amounts.