Ron's Trunk:

5 Chudley Cannons Shirt

16 pairs of Chudley Cannons socks

35 Chudley Cannons underwear

36,364 Chudley Cannons memorabilia

A copy of "Wizarding Chess and You"

137 snapshots of Hermione

A stolen Prefect Badge

Red hair dye (I knew his hair wasn't all natural)

Rope

A copy of "Kidnapping Famous People"

Harry's schedule and home address (I sense a connection here)