I always have UPGCS sheets on hand as I sell different sizes and shapes of used products and the flat rate boxes rarely fits any of them. Being able to minimize the empty space inside the shipping box saves me a lot of money on postage cost and filling material plus I can use the extra sections from the sheet for cushioning.

A very interesting concept that fits my packaging needs as an online seller. I used to stock piles of cardboard boxes in a hope that one of them will fit that odd shaped part. Before UPGCS I would have a hard time making a custom box that looks professional but now I cannot wait to package my next shipment because it is so much fun.

I used to use a carton sizer which would adjust only the height of the box but I would still need a box with matching width and length for my item. Now, with UPGCS, I do not have to go through all this hassle as I can customize all dimensions and end up with a shipping box that is just right for my item.