The manfrotto advanced tri backpack small will fit your digital slr with standard lens attached 1 2 additional lenses a flashgun and accessories the advanced tri backpack offers 3 ways to store carry and use your gear thanks to its innovative design the tri backpack can be worn as a backpack sling bag or x position in the backpack or x position with the straps across your chest you can easily and quickly swing the pack to your left or right side by simply releasing the quick release b