Think Tank Photo introduces the Sling-O-Matic 10, 20 and 30, the photo industry?s first sling bags that can be easily switched back and forth to either shoulder. The Sling-O-Matic?s adjustable, fully padded shoulder strap ?automatically? slides along a set of rails to change which shoulder the bag can be worn on. This is the innovative solution to the problem inherent with other sling bags: only being designed to wear the sling bag over the same shoulder. With one smooth motion, the Sling-O-Matic can be quickly switched to the opposite shoulder without losing the characteristics that have made sling bags popular among photographers. The Sling-O-Matic series offers three unique bags to choose from, depending on the set of photo gear a photographer needs to carry.