

I make my boxes -- I learned at a bakery I worked at -- I buy windowless sheet cake boxes, cut them to size -- often have to tape two together to get the sides high enough -- and I often just wrap the top with plastic wrap taped on --


I agree that you can either make your own or use moving boxes for your larger cakes.
I made a box out of leftover foam board for a pull apart cupcake cake. For the lid I have a roll of cellophane from another craft project, but I could also use plastic wrap taped around the opening.

I found part of an old tutorial I made a while ago -- when I still used normal punctuation -- ha!
So you can tape any size boxes, like you can tape two sheet cake boxes together flat if you need that much room--we are disregarding the pre-folded creases imprinted on the cardboard and ignoring the flaps and folds. Remember you will want this to be able to be taller than the cake so you can cover with plastic--you can always get moving boxes too, but for my purposes with this cake that was not practical--for a stacked cake it would be.
Put your cake in the middle and mark around it. Then score it with scissors or a knife. Make the creases along the scoring.
Make the 4 cuts on the short side of each of the new creases --cut just up to the markings you made. This enables you to fold the pieces up & around the shorter sides--tape everything in place---so you can now cover the top with plastic wrap and your cake will be as secure as possible. I also drop a frozen freezer pack into a plastic bag with a folded paper towel to absorb any moisture and wire it into the corner of the box or set it under the cake--makes me so much happier when delivering.
This is the real reason I was making boxes at the last possible minute and didn't have them ready in advance, to keep the cat out of them. (that's a spidery defect in the flooring just outside the box there--not dirt!! :) You also want to be sure your car seat is level--fold a towel or blanket to make it so. In vans & wagons many people use that puffy nubbly shelf liner so that the cakes do not slide.
(this box was discarded -- not used for cake)
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