Yeah, you can just make a sheet fuse the sides together and cut any excess off but becasue of the zip, I do this for the make-up bags. Post your version Shivi!!
Because you are working on the zip lock bag it takes the shape of the bag, you are basicaly only covering the bag with old plastic bag, if you are still stuck get back x
does the ziplock become part of the makeup bag, or is it just a mould?