Size and weight requirements

Each Registered Mail™ item must meet the size and weight specifications shown below.

Registered Mail – U.S.

Metric
Imperial
Requirement Minimum Maximum
Length
210 mm
8.3 ounces
380 mm
15.0 ounces
Width
140 mm
5.5 ounces
270 mm
10.6 ounces
Thickness
1 mm
0.04 ounces
20 mm
0.8 ounces
Weight
Not applicable
Not applicable
500 g
17.6 ounces

Registered Mail – International Standard letter

Metric
Imperial
Requirement Minimum Maximum
Length
140 mm
5.5 inches
245 mm
9.6 inches
Width
90 mm
3.5 inches
156 mm
6.1 inches
Thickness
0.18 mm
0.007 inches
5 mm
0.2 inches
Weight
Not applicable
Not applicable
50 g
1.8 ounces

Registered Mail – International Standard card or postcard

Metric
Imperial
Requirement Minimum Maximum
Length
140 mm
5.5 inches
235 mm
9.2 inches
Width
90 mm
3.5 inches
120 mm
4.7 inches
Thickness
0.18 mm
0.007 inches
Not applicable
Weight
Not applicable
Not applicable
50 g
1.8 ounces

Registered Mail – International Other Letter-post

Metric
Imperial
Requirement Minimum Maximum
Length
140 mm
5.5 inches
380 mm
15.0 inches
Width
90 mm
3.5 inches
270 mm
10.6 inches
Thickness
0.18 mm
0.007 inches
20 mm
0.8 inches
Weight Not applicable
500 g
17.6 ounces