A few years ago now I gave Mac's cousin a college survival kit as a high school graduation gift. Thankfully she really liked it, so I have given the gift to other high school grads a couple of times since then. The most recent time was a few weeks ago. I updated it a bit with hand sanitizer that has essential oils to help keep colds away and one of these zippered coin pouches from Etsy to hold either headphones or a flash drive. I had purchased a yellow polka-dotted one before for my headphones and one for Mac too...and even Sean uses one to put his wedding ring in his gym bag for when he is out coaching after school. They are so great that I purchased a handful this time to be stocked up for little gifts.
I still feel like it's random to give things like kleenex packets and carabiners for a high school graduation gift, but it seems to work.