My explorers ring.I use it so much.I use it to travel around quite a bit plus it is one of the things that are most useful while in f2p.I wish there were more items like this in f2p.
However my quest cape which I got 6 days ago is a close 2nd.Oh and cause it looks awsome my cramulet is 3rd.
Wees
It would be a tie for my favorite item. I love my lumberjack top because it took soooo long to get. But i also love my inferno adze because its useful and looks cool.