That pack looks pretty sweet, but I've managed a more budget idea:
two M9, M24, Type 97b, Tippman 98 Custom and all gun accessories in the cases
Accessories bag, plate carrier, elbow-forearm pads, shin-knee pads, combat belt, holsters, dropbags, Desert Eagle in case, BDUs, gloves, spare goggles. Normally I'll just clip my helmet to the hand straps.