This is where I keep extra stickers and any small merch that I don't have a good space to display!
I've had this rainbow boxes-in-a-box for about a year-- got it from Michaels for $15 on sale! The only new part is I just used my Cricut machine to add these cute labels to it, which I think looks great. (My only nitpick: I should have capitalized "Pokémon"!)
I use it all the time when I want to add stickers to mail for a friend or to someone's Etsy order. Great to have all the stickers in one place and organized! (or to completely cover mail for my boyfriend @Omii with dozens of random stickers. I love stickers.)
QUICK EDIT: Also, if anyone wants to trade stickers with me, feel free to send me a message on Discord @ sybaritick and I would happily send you some of my mouse art ones in exchange for some of yours!