Any side of the box used to package goods of various standard sizes should not exceed 25 inches, that is, 63.5 cm.

There is no clear limit to the box size of a single SKU, but it is only stated that the box size can be adjusted according to the maximum box size of UPS (UPS official website: length+circumference

Overweight standard:

The weight of a single box cannot exceed the standard weight limit of 50lb, unless the only commodity in it weighs more than 50lb.

For a single overweight product that exceeds 50 pounds, obvious "team transportation" labels should be attached at the top and around the outer box.

For a single product that is overweight over 100lb, obvious "mechanical lifting" labels should be attached at the top and around the outer box.

A single box for jewelry and watches can't exceed 40lb?

Tray size: 40 "x 48" x72 "/1.2x1x1.8m, 1500lb.