paintball warehouse shipping charges - someone enlighten me!

[Morter]

I added a halo B to my shopping cart, went to the checkout section and the P+P charge was £16 "due to its size and weight" is this right, or is it messed up?

 

[Mario]

my knees pads were summat like 7 quid in postage and packaging. can't fault the service tho. they helped me out big time.

 

[Mordhir]

as far as i know with royal mail you only pay for the weight of an item, not the size