All commuters and regular cyclists will know that if you are travelling a long distance to get to work or to complete the next leg of your tour a waterproof and dust proof bag is an essential keeping your possessions dry and safe is a must and its the only thing that the flight backpack knows this is ensured by the abrasion and tear resistant pu coated nylon fabric the waterproof connection of the screwed fixed back system and the waterproof tizip zippers lockable 2 way zipper for the main