I'm 13 years old but I'm not sure if I could start packing..If I could pack on the holidays and the weekends, what could I use??
Roll up a sock (or two depending on the type of sock) and stick it in your underwear. You'll also probably need some way of keeping the sock in place, like pinning it to your underwear using a safety pin or two. I've only really done this once or twice while alone so I don't actually know if this all that works well.
