We all know the importance of carrying an extra lens on our ride in case conditions change, but simply throwing a lens in your backpack is a recipe for scratches. The 509 Aviator 2.0 Lens Case has you covered. Offering rugged hard-sided protection, it opens like a book, cradling your lens inside its compression molded interior to protect it from all that lurks in the bottom of your backpack. One size fits all Aviator 2.0 Lenses.