Registered Mail dimensions and weight specifications

You can buy Registered Mail™ service for items that meet the following length, width, thickness, weight and ratio specifications.

Click to view table

What is the aspect ratio?

The aspect ratio is the relationship between the length and width of your mail piece.

×
Category Length Width Thickness Aspect ratio Weight
Standard min. 140 mm
(5.6 in.)
90 mm
(3.6 in.)

0.18 mm
(0.007 in.)

1.3:1 2 g
(0.07 oz.)
max. 245 mm
(9.6 in.)
156 mm
(6.1 in.)
5 mm
(0.2 in.)
2.6:1 50 g
(1.75 oz.)
Other min. 140 mm
(5.6 in.)
90 mm
(3.6 in.)
0.18 mm
(0.007 in.)
5 g
(0.17 oz.)
max. 380 mm
(14.9 in.)
270 mm
(10.6 in.)
20 mm
(0.8 in.)
500 g
(17.5 oz.)
Prepaid envelopes
Standard Letter   240 mm
(9.4 in.)
150 mm
(5.9 in.)
50 g
(1.75 oz.)
Other Letter   318 mm
(12.5 in.)
241 mm
(9.5 in.)
200 g
(7.1 oz.)