Tamrac TA-T0340 Arc Flash Pocket 1.0 Case - New 

This is a portable case that can be attached to your belt, rucksac, or  needed. Inside, you can store a lens of flash 

such as the Canon 580 series, Nikon SB910, and lenses like the Canon 18-135 Nano,Nikon 60mm F2.8 AF S Macro, etc