The Think Tank Digital Holster 50 Expandable Shoulder Bag V2.0 is a great shoulder bag that remains inconspicous when you're travelling giving you the peace of mind that your valuable equipment willl not be targetted by thieves. Great for pro size DSLRs, the capacity of the Digital Holster is impressive, holding a 70-200 2.8 with the hood reversed OR in position, a wide angle with the hood and a pro-sized SLR in the front expandable pocket (without a lens attached). Such capacity is allowed by a 'pop down' which increases the bag height for keeping th lens hood in shooting position. There is also room for an SLR without a bottom battery grip to be put inside with a lens attached. The Think Tank Digital Holster 30 Expandable Shoulder Bag can also can be attached to a roller- a usefull feature when travelling with a lot of equipment. Two additional features of the Think Tank Digital Holster 30 Expandable Shoulder Bag are the YKK locking zipper sliders that provide security for your equipment and the organisers situated on the inside of the front flap allowing rapid access to all your essentials at a moment's notice. As with all Think Tank photo products, the Think Tank Digital Holster 30 Expandable Shoulder Bag comes complete with a seam-sealed rain cover to protect your valuables from the elements.