Another Click And Send Question

Hi All

I have a parcel to send which weighs under 500 grams but it is too large to fit into a 500 gram satchel. It will fit into a 3 kg satchen with out any problem, Can I put this item in the 3kg satchel but only pay for the 500 gram price when I use C&S. If I select 500 gram code and use a 3 KG Satchel.

Thank You

Crowsman