I'm trying to sell soda(in 12oz cans) at school without being caught. The thing is, my school requires you to put your bags in an xray machine for screening before being allowed in the building. I usually carry my snacks in a duffel bag; if I put the sodas there will they be able to see it? Usually I try to make it pass a quickly as possible by putting my bookbag after but I'm not sure if it's going to work with soda cans. Any suggestions?