I was in the military far too long ago to be familiar with the MOLLE system (we had the KNAPSACK system of WWII vintage.)

This is second-hand, but I read a review somewhere that indicated Granite Gear's Ultralight hipbelt was compatible with MOLLE gear. I looked on their website, and noticed they also sell a "tactical" pack line. You might want to check some of their stuff out, just don't get your hopes up based on my skimpy knowledge.