These boxes can save you a fortune in postage - our PiP Large Letter Boxes are designed specifically to fit through the Royal Mail's large letter PiP slot, to give you reduced post charges. Manufactured from hign quality, strong but very thin corrugated cardboard they maximise in a box what you can send using the Large Letter postal service.
Royal Mail Slot Size Chart
- Styles and usage. A 'letter box', or 'mail slot' in American and Canadian usage, is a slot, usually horizontal but sometimes vertical, about 30 cm by 5 cm (12 inches by 2 inches), cut through the middle or lower half of a front door.
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- Need to post a heavy or large parcel, or both? Take a look at our parcel weight and size restrictions for our international services and mail formats.
| older postbox ; smaller slot |
The biggest slots are pobably in new areas and also at the local main post office.
Note : The slot slopes upwards
The slot tends to slope upwards (e.g. to keep out rain I guess), so if tight, it could be worth trying to push the parcel in slightly upwards (to follow the angle).
Can you put parcels in postboxes :
Royal Mail Post Box Slot Size
My understanding is YES. I have put parcels in.Estimate sizes :
An estimate would be between 8-12 inches wide and maybe 5.5cm high (or smaller).
Royal Mail Slot Sizes
Width : In old areas, it can be as little as 8 inches wide. But in the newest areas it may be around 12 inches wide. And areas between old and new may vary between these sizes. This rule probably applies to height as well.
Height : As mentioned above, the newer the postbox the more likely it has more height. My local postbox made around 1981 is probably around 5.5cm high.
I use a postbox probably built around 1981 which has a bigger slot than older versions (both in width and height)
Examples for 1980's postbox slot :
Using a circa 1981 postbox, I have found the following :
| UK postbox slot (1981) | width | height |
| 20 cm : fits easily 25 cm : fits quite easily large letter size (exactly) : should fit 1980+ slot easy | 4.8cm high package : fits easily 6 cm high box : does not fit |
Note : Older postboxes tend to have much smaller slots !