how many bags does it come with?
MARK S This Purchase comes with one bag. You choose the size. You will only want to carry one.
DANIEL J A Just one. You select a size. I would recommend the 2L as it's a really nice size for various types of hikes.
JOSEPH F R All MSR Hydro bags are packaged as single units.
TROY C Quantity =1 will get you one bag of the size you choose (3 sizes from which to choose).