These things are rugged and the material is similar to my Base Camp bag. Any and all liquids - stuff them right in. Very nice protection from getting crud on the clothes in your bag. And, works for possibly messy food items - if they're in here, I know they're not ruining my stuff. They're very well made - good zippers too. Eagle Creek stuff has never disappointed - I have backpacks and a ton of those packing cube organizers.