First I cut them in half. Paper cutter goes through them like butter.
Then I broke out the trusty food storage bag sealer and sealed the open sides. I use deluge on half of them to see how it worked for those of you that don't have a seal a meal type doo hickey.I tried glue and it didn't stay stuck. You would probably be able to use a tape runner though.
Next I very carefully cut a slit across the top through just one layer. You could cut it before you seal the sides but everything didn't want to line up straight because of how slippery it is.
Last but not least, you put your stamp set inside. Yay! This will help keep dust off. I also wrote on the white part at the top what the stamp set was so you could flip through and find the one you are looking for easily.