I do a lot of canning at home and I have a lot of mason jars. This helps carry them around to take to the office or to gift a few mason jars full of yum.
The lid is removable and the carry handle sticks through. There is a little room to spare inside each cell that can be used to add cardboard padding or napkins.
This uses 1/4" plywood and can be cut in 2 1x2 sheets. It assumes a nominal thickness of about 0.20". This SVG is the second revision and I hope to have one more.
The fingers are a bit long for 0.21" thickness. In the example I shaved off the tabs with a chisel. It is not required but it certainly made sanding and urethane easier!
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