Top view of TD369's backpack. The lettering scheme featuring the Imperial Font is -369's designation, a great touch. Applied in a similar fashion to TK103's design of lettering expertise.
Not seen in this illustration, -369 was fortunate enough to locate a base fixture (the box or tub itself) that is JUST the right size to fit snug around the ridges on the upper back plate armor. He need only use Velcro and the backpack fits securely on the armor. The straps are only secondary.