I love these envelopes. I've noticed a lot of scrappers use the smaller ones for the pennies collected at the Disney parks. I recently used a larger one to hold four pennies and they actually stayed put inside. I didn't have to glue them apart to be shown. I also want to use one large one to hold our park hopper passes for the first Disney page in the album.
Excellent for storing park passes, room key, & special event card like Mickey's Very Merry Christmas party & photopass cards. I like to put these items in my scrapbook. This will keep them nice. The only concern I have is that it may cover part of the card. I may even store some pins.