I've seen garment-bag-style panniers that hang over both sides of the rack. In my experience, rolling clothes (with that which is most likely to wrinkle on the

I've seen garment-bag-style panniers that hang over both sides of the rack. In my experience, rolling clothes (with that which is most likely to wrinkle on the outside) leaves them far less wrinkly than folding them. It may be worth a try. Also, I ofter hear of people bringing all of their formal clothes on Monday (whether driving or by e.g. bike trailer) and leaving them at the office through the week.