Ventilated backpacks have suspended mesh back panels to help dry perspiration when you're carrying a backpack. The mesh is suspended above a concave cavity so there's a big air space behind your back to help evaporate moisture.
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Many schools are now requiring students to carry a backpack that is either clear or mesh for their safety. This new rule is just one of the many ideas that schools are coming up with to try to make their classrooms safer.
Concealing ContrabandWhile certainly not the overwhelming number of cases, such instances have led to some administrators banning backpacks to dissuade students from sneaking illegal and dangerous items onto school grounds.
A roll-top backpack is a type of backpack that has a roll closure at the top instead of a standard zipper. The top of the backpack folds over itself several times and then buckles or clips to seal closed. This style of closure provides a water-resistant seal and allows the backpack to expand to accommodate more items.