Ideas:
- Hoodie -- plain, school mascot or favorite sports teams
- College tee shirt
- Tools -- every man needs tools; get him one tool each year, and by the time he moves out he'll be well prepared
- An outfit suitable for office work -- yes, seriously. Once my girls hit high school I started buying them a nice, adult outfit (in addition to other gifts) for their birthdays and for Christmas. Things like pencil skirts, nice trousers, dressy blouses, classic sweaters, office-appropriate shoes. All simple, classic styles. They didn't appreciate them much -- until they got to college and needed clothes for jobs, internships, various university events. I started doing this because I had too many student teachers come in wearing all they had -- mini-skirts and leggings.
- 3D printer and filaments
- PJ /lounge pants
- Cute boxer shorts
- Simple cookbook + ingredients
- Science experiment materials
- Tickets for sporting event, concert or other experience -- tickets to a college sporting event could spur conversations about post-high school life
- Portable charger for cell phone
- Command hook's wall-mounted cell phone holder -- my girls love these
- Duffel bag sized for overnight trips
- Fast food gift cards -- for going out with friends
- Sunglasses
- Class ring
- Nice water bottle
- Pack of nice ink pens
- Subscription box
- Subscription to a streaming service -- my youngest was thrilled when we got her a subscription to a horror movie site
- Archery equipment
- Nice alarm clock
- Electric shaving razor
- Fishing rod + tackle box
- Lessons: canoeing, karate, a musical instrument -- we gave our kids private driving lessons (instead of going through school driver's ed), and they were beyond thrilled
- Beef jerky and sunflower seeds in the stocking
- What's something he has but could use an upgrade? Bicycle? Backpack? Belt? Boots?
- Subway sized poster of his favorite musical group -- buy from ebay
- Big tin of popcorn -- or packs of Cracker Jacks -- my kids always loved this
- Packets of fancy hot chocolate
- Polaroid camera + film
- Framed picture of you together
- Vintage concert tee shirts
- Flashlight (or head lamp)
- Gift card for hair cut at Sports Clips
- I know you said no sports equipment, but what about a gym membership?
- Lanyard
- Fancy flash drive