Stay away from the clear brittle plastics (PET) variety. For some reason, they can cause problems with the fuel. Try to stick with something that is for flammable liquids, any gasoline container should suffice. High density polyethelene (sp?) or HDPE is just fine.
Insure the caps or seals will give you a 100% airtight seal, I have gasoline cans that do not seal very well and leak when tipped over regardless of how tight the caps were.

Fuelman