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.
What is the aspect ratio?
The aspect ratio is the relationship between the length and width of your mail piece.
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| Category | Length | Width | Thickness | Aspect ratio | Weight | |
|---|---|---|---|---|---|---|
| Standard | min. | 140 mm (5.6 in.) |
90 mm (3.6 in.) |
0.18 mm |
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.) |
|