My 15 yo DS uses a card holder that is attached to his phone with adhesive. I ordered them on amazon. Nothing fancy but he's not prone to losing something attached to his phone.
DS12 hasn't started regularly carrying money yet other than the $20 he keeps tucked in his phone case. He does have a wallet that's made by Nike to keep his spending money.
DD10 got a new wallet for her birthday from my mom. It's a grown up wallet that's hard to carry on it's own but since she doesn't need daily money yet, it's okay for now. I bought this wristlet for myself a few weeks ago for times I don't want to carry my big bag and love it. I'm going to buy one for DD for Christmas. It seems perfect for a tween/teen. https://www.nordstrom.com/s/tory-bur...ases&color=349
Mom to Two Wild and Crazy Boys and One Sweet Baby Girl