prepaid label and quantity

[wka3369.o9pzahtcm]

a buyer has ordered 2 items in a single transaction, i use simple prepaid delivery and the postage covers 35cm x 35cm x 16cm, will  the prepaid label cover both items packaged together as the size will be larger than 16cm now.  The cost of this label is slightly more than the cost when people purchase only 1

[4_bathrooms]

A Simple Delivery label is valid up to the maximum size and weight that the service will accept as long as you don't manually change the weight or dimensions.

Is this a Royal Mail label? 

[wka3369.o9pzahtcm]

label usually covers 35cmx35cmx16cm,  but the 2 items will make it 35x35x30cm. It could be Evri or Royal mail, Label normaly costs £2.74 but this time it £3.04 

will hope for the best, it may just be me not finding but it seems there is little or no info on a label once purchased such as what said label will cover 

[4_bathrooms]

As I understand it Special Delivery labels do not indicate the size nor weight that eBay pre-selected. As long as the package is within the service's maximum limit it is supposed to be accepted:

You haven't specified the weight of your package but the dimensions are well within all of those limits.