W stands for width, h stands for height and d stands for thickness.
Extended data:
Bag size measurement.
1, upper width? . Cover type: open the cover and measure the length of the inside of the mouth from left to right; Magnetic buckle type: look at the widest part of the bag mouth with magnetic paste, and measure the width of the inner mouth with your hand.
2, thick. ? Rectangular bottom hard bottom: measure the length of thickness.
3, high. Horizontal and vertical squares: the height measured from the hard bottom edge of the bottom to the middle of the bag.
Generally, a tape measure is used to measure the size of the bag, and the tape head is loose so that we can measure the size. There are two ways to measure dimensions with a tape measure. One is hanging on the object, and the other is propping on the object. The difference between these two methods lies in the thickness of the iron sheet at the head of the tape measure. The function of loosening the tape head is to compensate the iron sheet at the tape head when the tape head abuts against the object.
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