I have these ones which are papershell and you can crack with placing 2 in your hand and squeeze.
I would put them loose in the box so more can fit rather than putting them in individual bags. In a medium flat rate box will hold 7.24 lbs. I can make it 7 if you would want even number of lbs. I don't have a large flat rate box so I have to get one before I can know how much can fit into it. These come out whole better than the round ones for pies
