Looking at what you have listed
your leather trousers can go into a small parcel up to 2kg surely ? either evri or Royal Mail
5.21 is evris price for 2-10 kgs
Check the package size selected
your tshirt if packed correctly might probably go large letter (wrap it around a piece of a4 card to stop it bunching up in transit and becoming a parcel)
Not sure about the 1kg of nails if they can fit into a large letter
heres the current prices
