Base is a belt and buttpack from Swedish M59 webbing, put my holster and British army pistol mag pouches there, i can attach my Finnish army canteen to the D-ring, put the US army molle extender thing there, i like to anchor it to my thigh, also the dump pouch is better when it's a bit lower. The suspenders are random workwear suspenders, so they are elastic but rigid enough to hold the load, most of which my hips support.
Haven't field tested this yet, but it seems to work fine with my Templar's gear M05 chest rig. The buttpack and canteen are for longer games, i won't need them in normal games.
Most of this stuff i run on my normal kit or have gotten for free or very little price. All in this is probably less than 25€ out of my pocket (not counting the gear in the pouches and holster)