Ashleigh, I'm not taking about using a Flat rate box but a regular Priority box, the 12x12x8. Surely that blanket would fit in it or a generic box that is not considered oversize.
Dimensions are the item ONLY + any packing around it, but NO box.
It's always been do NOT put the box size.
You put the box size when printing the shipping label.
If you flatten the blanket to get it in the box, use it instead of it not being flattened out.
If you put the box size then the calculator is only going to put the item in an ever bigger box.
For it to come up $35 it has to be figuring shipping on an oversize box.
Any box that measures more than 12x12x12 is oversize to zones 5-9.
A 13x12x12 is oversize, a 15x12x10 is oversize.
But a 14x12x10 is not since those 3 measurements are still 36".
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Do you use Etsy's box sizes or do you list your box sizes under package preferences or use both?
I list boxes I want the calculator to use and disable Etsy's boxes.
If you don't have a box to fit an item in, then the calculator will either use that item size or if you have a box that is way bigger, it would put the item in it.
Also if you don't have boxes to fit multiples in then your buyer will be charged shipping on several boxes.