This year is my preschooler's first school Valentine's Day exchange! Her favorite thing right now are what she calls "up stickers" or foam stickers so I bought a couple bags of them at Jo-Ann (50% off, what!?) and divided them - 10 stickers per kid. There are only 12 kids in the class so I had plenty of stickers leftover for Ally to keep. Then I put the stickers in small plastic baggies (3"x 4" - can be found at Michael's in the candy section, or online), and topped them off with these tags.
As you can see they're folded down the middle with To/From: on the back. I printed on photo paper. Staple them in 2 places to secure the tags to the bags. Here's a jpeg...
Here's a Link to PDF
Thanks for looking!