When I bought this little piece of Tupperware, it was described as a business card holder. (I’ve also seen them described as recipe card holders, which makes more sense since Tupperware mostly makes food-related items.) Sadly, I was disappointed that, at 4″ wide, it is a little too big to properly hold a 3-1/2″ business card. The cards will always sit at an angle because of where the braces are on the bottom; that’s not a big deal, and I suppose I could modify it if it really bothered me. It also works pretty well for postcards, but if I put three different postcards in it, you can only see the first one since they are all on the same level.
However, this little beauty comes in very handy to hold those little rulers that are always getting lost. It can easily hold my 12″ ruler, but I like it for my 1″ by 6″ ruler, my “add-a-quarter” ruler, my 5″ by 5″ square ruler, my 4″ by 8″ ruler, and other small rulers that are nice to keep within arm’s reach.
To hold my business cards when I travel, I use Tupperware’s mini square round even though exactly it’s not blue, but it’s as close as I can find.