You can buy Registered Mail™ service for items that meet the specifications indicated below.
Standard Registered Mail
| Standard mail specifications | Dimension | Minimum | Maximum |
|---|---|---|---|
| Length | 140 mm (5.6 in.) | 245 mm (9.6 in.) | |
| Width | 90 mm (3.6 in.) | 156 mm (6.1 in.) | |
| Thickness | 0.18 mm (0.007 in.) | 5 mm (0.2 in.) | |
| Aspect ratio | 1.3:1 | 2.6:1 | |
| Weight | 2 g (0.07 oz.) | 50 g (1.75 oz.) |
Other Registered Mail
| Other mail specifications | Minimum | Maximum | |
|---|---|---|---|
| Length | 140 mm (5.6 in.) | 380 mm (14.9 in.) | |
| Width | 90 mm (3.6 in.) | 270 mm (10.6 in.) | |
| Thickness | 0.18 mm (0.007 in.) | 20 mm (0.8 in.) | |
| Aspect ratio | - | - | |
| Weight | 5 g (0.17 oz.) | 500 g (17.5 oz.) |
Prepaid Registered Mail envelopes
| Prepaid Registered Mail envelopes | Standard letter | Other letter | |
|---|---|---|---|
| Length | 240 mm (9.4 in.) | 318 mm (12.5 in.) | |
| Width | 150 mm (5.9 in.) | 241 mm (9.5 in.) | |
| Thickness | - | - | |
| Aspect ratio | - | - | |
| Weight | 50 g (1.75 oz.) | 200 g (7.1 oz.) |