This is super easy and you can make 1 of these little totes for your 3x3 cards in as little as 15 minutes. This is my very first tutorial so bare with me. LOL
Cut paper 8"x5 1/4". Score at 3 1/4" from bottom. Score at another 1 1/2". Then the other part should measure the same 3 1/4". Now score at 1" from sides. Cut with scissors at the bottom to make flaps that will go inside at the bottom. Glue at sides. Cut white cardstock for handle 3 1/4" wide x 8" long. Cover with patterned paper. Attach using brads at the top.
This should only take about 15 minutes from start to finish.