They would be perfect for funneling liquids, but not so much for powders (which is why I returned). However, I can say that they expand and collapse very easily, making storage easy.

They work as described and are convenient when folded, taking up much less room.

I like these but they are all same size and are square.

I love how you can collapse them for easy storage and there's different sizes in the pack. However, they don't stay up very well when pouring liquids in it. You need to go slow, not fast. Otherwise, the liquid will be to heavy for it at the top and it'll start falling to the side.