Camelbak Reservoir Dryer comes with a collapsible frame and trim-to-fit design so you can dry your reservoir quickly and completely.

Collapsible design allows your reservoir to dry quickly
No trimming necessary for 100 oz (3 L), 70 oz (2 L) reservoirs 
Trim at point "B" for 35 oz (1 L), 45 oz (1.4 L), and 50 oz (1.5 L) reservoirs 
Trim at point "A" for 72 oz (2.1 L)and 102 oz (3.1 L) reservoir