Crinkly problem

Hi all,
I have just begun to seriously commute by bike which is great however
I have to wear formal clothing which means an ironed shirt etc. When I
get to work my freshly ironed shirt looks like a dishcloth and my
trousers look like a pair of pyjamas.
Has anyone found any devices or novel way of preserving their gear? I
use a backpack and cannot use panniers.
Many thanks
Caher


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Caher