I made a stack of these for advent ‘calendar’ bunting. I used squares of 15 cm lightweight paper (and half A4 sheets of magazine papers), scissors and glue. That’s it.
With pretty side face down fold 1 cm in from the right, then 1 cm in from the bottom then bring the left side over to the (folded) right edge and crease, then finally fold down 3 cm from the top.
Unfold and cut along the crease lines. Chamfer (angle off) the edges as shown.
Glue the pretty sides of the two 1cm remaining tabs. this leaves the top flap open until filled when it can be stuck down or tucked in
These pockets are great for little gifts or gift cards and can hung on a tree or sewn into bunting. Halloween versions are fast and an advent series could be hand numbered and pegged on a string.