Gift for boyfriend

My mans is leaving in 4 weeks to go do his basic training for the military. He’ll be there all summer

I want to get him something nice that’ll remind him of me and make his heart go

We’re 17, we’re each other’s first love and we’ve had this thing for 5 years (we broke up a few times acting like the little kids we WERE 😂)

THINGS SUGGESTED ALREADY: he already wears a watch that he loves and refuses to give up, I’ve gifted him shirts and he has plenty already and I’m not giving him that dumb hunting stuff or anything camo because he’ll have enough of that when he leaves.

I just suck at giving gifts and I don’t want to give him something that he

A- can’t take w him/has no use for

B- is too sappy or will get him made fun of or something, idk