20 mile round trip which i do at least 4 times a week. I leave my shoes and belt at work which means i only need to carry trousers, shirt, underwear and food which i carry in a alpkit rucksack.
I usually double up on clothes and food one of the days so i can do a longer ride one day a week with no rucksack.
I use a boardman cx with 28mm gatorskin tyres which works well all year round.