Made from ultra resistant material and absolutely crammed with features!
There are two separate compartments, the main compartment is vented and very large. 

In addition to the main storage space this compartment has one large and two medium sized netted sub-sections.

The smaller of the two main compartments has a small netted area, and a small zipped pocket great for

keys etc and a separate lined and Velcro fastened section perfect for your phone or MP3 player,

this compartment also has a hole on the front for feeding your headphones cable through so you can listen to music on the move.

On the front is a third small compartment, and two small netted sections on the sides