I can't have enough of them. They're so useful - i can stuff them with all my 'petit bazar' (little mess).

I also heartily endorse Muji's Zip bags. They are like a sturdier version of the sliding ZipLoc bags.

You can store all sorts of things in them (one of mine holds pens and pencils; another assorted tools) as the plastic is strung and sturdy. Nice frosted look allows you to see the contents.

It's a zip bag. If you need to get one, make it this!