Dimensions were always written L x W x H but now it seems the USPS has eliminated width and replaced it with height and now has depth as the last dimension. So my Length is 8.25" and height is 6.75" and depth is 3"
250 First-Class Package International Service
https://pe.usps.com/text/imm/immc2_021.htm
251.22 Dimensions — Other Than Rolls
Packages (small packets) other than rolls must be within the following dimensions:
- Minimum length: 6 inches.
- Minimum height: 4 inches.
- Maximum length: 24 inches. Length is the longest dimension.
- Maximum length, height, and depth (thickness) combined: 36 inches.
- The postage, address, customs form, and other required elements must appear on a side that meets the minimum length and height dimensions (6 inches x 4 inches).