I keep things

And this is proof.

This is from about 20 years ago. I can't remember exactly how it was, but I think we were going to visit my uncle and aunt around my birthday, and my cousin sent this gift voucher to me beforehand.

Now this is how you do things! 

The gift in question was a Garfield bag (hence the clue). The bag is no longer around; I think it was thrown out after it got old and moldy. (unless if my mother still has it stashed in a cupboard somewhere... but I don't think so)

Edit (26 Aug 2015):
My mother found the bag!

Still looking new. Garfield doesn't look a day older! Haha...