Think Tank Glass Limo BackpackThink Tank Glass Limo Backpack Narrow light weight backpack specifically for long lenses up to an 800mm f 5. 6 or regular DSLR gear Features: Accommodates large glass or a medium large sized kit of standard zoom lenses Specially designed collars for long lenses Specially designed zippers hold their position to avoid accidental opening of the main compartment Expand the bag's capacity by adding up to three Modular Pouches for lenses, camera bodies,