I have a eagle multi purpose chest rig, the one with the zipper and H-harness type straps. I'm looking at adding a hydration carrier or small assault pack to the back of the rig. It came with these velcro pieces about 10" long with velcro on both sides that fits onto a foldover on the straps so that there is a female buckle facing backwards on both sides... i'm assuming this is some kind of system to attach packs on the back but I can't figure out what it's supposed to work with.

The literature for this rig says "Yote and MAP assault pack compatible". I don't own either of these, can anyone that has one tell me if there is an attachment method that goes with the chest rig buckles? From photos online it looks like they both have a molle style attachement setup like would go on a PC back panel.

I also mention LBT since the 1961 chest rig has similar female buckles that look like they are sewn in around the same position as the eagle rig.