As I wrote in this post, I've been enjoying using my new smash book. As I have a few things I don't want to stick down, I've been making little envelopes to store them in.
The only problem is that packaging envelopes are often the wrong way round for scrapbooks: the pretty side is the flat side you want to glue down. But it's so easy to switch this. You just need to peel back the side with the flap, like this: