This cap makes it so much easier to use your Platypus bladder to store water in camp. Before I had it, I would prop up the open bladder against a log or a rock and hope it didn't fall over. That, or I had to keep it connected to my backpack and disconnect whenever it was time to eat or have tea. Now I don't have to worry because the bladder has the cap on. Duh!
This review was written in the old system and had content requirements that are different than reviews written today.