Priority mail flat rate box dimensions
The dimensions for Priority Mail Flat Rate boxes are as follows:
Small Flat Rate Box:
- Length: 5.5 inches (14 cm)
- Width: 8.5 inches (22 cm)
- Height: 1.5 inches (3.8 cm)
- Weight limit: 70 lbs (31.8 kg)
Medium Flat Rate Box:
- Length: 11 inches (28 cm)
- Width: 13.5 inches (34 cm)
- Height: 2 inches (5.1 cm)
- Weight limit: 130 lbs (59 kg)
Large Flat Rate Box:
- Length: 12 inches (30.5 cm)
- Width: 12 inches (30.5 cm)
- Height: 5.5 inches (14 cm)
- Weight limit: 70 lbs (31.8 kg)
Extra Large Flat Rate Box:
- Length: 14 inches (35.6 cm)
- Width: 18 inches (45.7 cm)
- Height: 12 inches (30.5 cm)
- Weight limit: 130 lbs (59 kg)
Please note that these dimensions are for the outside of the box, and the contents should fit within these dimensions. Additionally, the weight limits are for the total weight of the contents, including packaging materials.
It's also important to note that the Priority Mail Flat Rate boxes are designed to be used for packages that weigh up to the specified weight limit, and that any packages that exceed the weight limit will be subject to additional postage charges.