The Sizzix envelopes are great for the storage of stacking dies. They take up very little space. I put a "stick up" tag on each envelope so at a fast glance I can see what dies are stored in each envelope. The envelopes can also be used for small cut out die pieces for future projects.
I love these envelopes. Some of the die sets do not come in envelopes. I always put my die sets on a magnetic sheet and store in envelopes. I will need to order more.....they are a must have.
LOVE, LOVE, LOVE these envelopes. I use them for storing my dies, but they are also handy for keeping all of the items I am using on a project together until the project is completed.