Using a cardstock 81/4" x 51/2"
score long side at 1-7/8, 3-7/8, 5-5/8, 7-1/2
score short side at 1-7/8, 3-3/4, 5"
Mark the 1st and 3rd boxes on the top at the halfway point. To score a triangle for the milk carton top.
From the center mark to the intersecting lines on either side score a triangle. Burnish all the folds. You may not be able to get the triangles to fold sharp but you can start them and then crisp them up once the box is made.
Mats should be measured on the box you make, everyone's boxes can be slightly different than another but just as a starting point. 1-3/4 x 1-3/4 mats should work. If you want to add additional matting just go down in size 1/8th of an inch on either side or to your liking.
I used glue to fold and punched holes at the top to thread string through to keep it closed. add your own sentiments.
These make cute gifts for craft fairs. I'm sure you can think of lots of things to put in them. Comment below if you make any.