If you have a wide variety of things to send by post then you will need a wide variety of stamps.
As all office staff know, one stamp will not fit all where posting is concerned; the stamp must fit the package.
For large items, you will need large stamps.
If you have a lot of these to send why not consider adding Royal Mail 2nd Class Large Letter Stamps to your Viking Order?
The stamps come in a pack of 50, which means you will not be sent running to the post office whenever you need one for a large letter.
Stamps of this type are ideal if you have A4 items which cannot be folded, and do not need to be at their destination the next day.
Search for Viking online.
Buy or review Royal Mail Postage 2nd Class Large Letter Stamps