Scrapbooking Tip - Storing Stickers

I know a lot of people who do scrapbooks. I love to make them, but have a limited budget, so I've come of with some ways to make my money go further. Instead of buying expensive sticker binders, I use the envelopes that come with my credit card offers. They come every day and are all shapes and sizes. I just write on the outside what category they are and when they wear out, I just get a new one. They're free and my stickers aren't around long enough for me to worry about the envelopes not being acid free.