I have Basil Panniers on my old schwinn cruiser that gets loaded up with groceries and farmers mkt stuff. Mine have held up well but it's only 10 blocks away, once a week. I would say there's plenty of room for 2 prs of shoes and a couple changes of lightweight clothing.

this is what I have http://www.niagaracycle.com/product_...ducts_id=21044