I do have a single sheet of puffy stickers, but I don't use them often. My current journal doesn't have magnetic lock, but most of mine do, so I have to be judicious in order to make the journal does close. It's why I needed to a giant file folder thing for my stickers; the pocket in the back of my first journal got too full!

Ooh, I'll have to check out Happy Planner; I haven't heard of the brand before.