They open up and have two sleeves inside for notecards or loose stationary, etc.
The idea is most definitely not mine! (being slightly challenged in the fold it and build it department, LOL) I searched and tried several tutorials from others more talented than I, eventually finding a gem of a tutorial from a blog by Tresa Black: Fabulously Artsy. Check it out, because it's great! Thank you to Tresa.
Her tutorial is for smaller boxes, sized for 4 1/4 x 5 1/2 cards. Scroll down on her page to view the comments if you (like me) typically make the larger sized cards. There are instructions for re-sizing it for 5X7 sized cards.
Here is a picture of the inside. This DP was not double sided and not quite as heavy as I would have liked, so lining the inside with heavy cardstock helped IMHO.
These boxes fit exactly into a CD mailing box that you can buy at the Post Office! They fit as though the box was made for them. I put each one into a large zip lock baggie, folded the extra baggie around the box and slipped it inside the CD mailing box. Such a perfect fit that I warned the recipients to cut open the mailing box carefully so that the contents would not get damaged.
We filled them with an assortment of Christmas cards, sympathy, get well, thinking of you and birthday cards. Depending on the thickness of your cards and envelopes, they will hold 8-12 cards & envies.
We sent these as gifts to family members and hope that they like them! (My Mom has already called me and was really tickled with it, so that's nice).
I'll be back later to post some of the Christmas cards from this year's production.
Wishing all of you a wonderful day and a joyous holiday season with your family and friends. Thank you for stopping by.