Pocketbooks* and backpacks are likely to have pockets. I use clothing pockets myself, but making better use of pockets in pocketbooks and backpacks might also be a useful habit.

*Wikipedia has it that pocketbook is an American (regional?) term for handbag, and it's certainly the word I would use if I were talking. I take purse to refer to a small wallet which is just a single compartment with a clasp on top. I would distinguish between a hand bag and a shoulder bag. I don't think I've seen pocketbook in print-- to the point where it looks like it could be confused with a paperback book.