What to buy him for our 6 yr anniversary?

Me and my boyfriend are coming up on our 6 year anniversary and I have no clue what to get him. (he's 24, if that helps) I want it to be something he can use, but not something thats to "mushy". 6 years is a big deal so i dont want to get him a sucky gift. Guys are so hard to shop for! Help!!!