Best Gifts for a Teenage Swimmer

My son is turning 14 and has been swimming competitively for 4 years. He will be away at a swim camp on his actual birthday so I am trying to think of fun things for him to open while at camp. The camp director is going to decorate his door and we are sending otter pops for them to enjoy that night. And since I am asking for help already...I would also take other ideas I might not think of for his actual gifts to suggest to family members. :)

Things that he doesn't need or has too many of:

• gear (goggles, bags, etc)
• new suit
• shirts/wall art with sayings about swimming

Things on the maybe list currently:

• another water bottle
• tattoo pens because the kids love to draw all over each other with sharpies, might as well give them more colors
• a swim magazine - but not sure which would be best
• Stretch gift that we are discussing with him - a Whoop

Okay folks - get creative! And thank you in advance. :)