What an intense Navy colour that wig is.
I don't want to dye but I will because it would be captured on film very bright. it is a blend of black and there navy shade.
The straped used on a standard sword bag now are the webbing nylon kind you can get at most fabric stores in a 1inch width. Just ask for strapping on a roll and there should have black as the standard, but they also make red, yellow, blue and orange.
I've also notice that his bag in the anime is of the heavy duty variate over the flat bag they show in the manga. It the same colour but the difference is the width meaning you can carry more then two swords or shina's. I've cheated and bought a travel Shinai Bag. IT's not 100% accurate (flaps black instead of red) but it's cool tone red and I'm also planing to use it to carry my Mami riffles to that it's more functional then just for display.