We did it again Kathy!.....typing at the same time!
Mignon, on a shipping profile you do not enter the weight and item size.
Now if you use only certain box sizes you need "disable" etsy's common box sizes and enter you own box sizes under package preferences section.
That way CS will only use the boxes in your list.
You have to use the new listing manager too.
You don't need but a few shipping profiles.
You can name them whatever you like, this is only for you.
If you only ship Priority, that is all you need. You could name it Priority items.
If you ship first class and Priority you need both of these on one profile.
If you use Parcel Select and Priority, you can do a profile for this.
As for weight and size, this only goes in your listing for each item.
Weight is TOTAL weight, item + any packing + Box, all packed and ready to ship.
Dimensions: Item + any packing like bubblewrap.
Also if your items are folded up to mail you need to measure them folded like you'd put in a box.
Example, if I had a yard of fabric, I would not put 36x44x1 for the item dimensions, I'd put what the fabric is folded up to mail, around 5x6x1.
If you can get several items in a box, you will need to figure out what measurements to put to get CS to put multiples in one box.
Example: if you use a 12x12x8 box and you put the item size a 11x11x7, CS is only going to put 1 of these in that box. If you can get 2 items in this size box you need to put 12x12x4 so 2 will fit.
Sometimes we have to tweak our dimensions to get multiple in a box.