I always had this crazy idea since I was a kid. Like when I had to carry a bunch of shit like backpacks and books and such.

Image if you can like open this small dimension anywhere you are and just place stuff in it. So let's say you have to go to school, you open up your little pocket dimension and put your backpack in it. Then at school you open it up again and boom. I suppose it would be bad because people can carry guns and shit in there. I call it a personal pocket universe btw.