Is this the 2 liter or 4 liter model?
WILLIAM F I believe this is a 2 L model. It filtered our water (mostly from very small creeks) quickly. The filtered water was cold clean and very refreshing.
RENSKE K The Platypus gravity filter that I bought in June 2012 came with two 4-liter bags. The system works brilliantly. Super fast, and is light weight. First I was a little suspicious because of the high flow rate. But I've used it for about 5 weeks out in the woods now and I've never gotten sick. I do select my water source carefully though.
CATHERINE M Each reservoir - the clean side and the dirty side - is 2 liters.
NATHAN P R The model consists of 2 2L bladders that are used together to collect 2 L of dirty water and then filter it into the other 2L bladder.