I'm the kind of person who writes up his load out before going on a trip.
Basically, I made a simple surface area calculator. Then I benchmarked the Weight and Carrying capacity of 511 and Aliexpress bags to create High, Middle, and Low-Grade Nylon Bags. Have a Cost to Weight Ratio, and just raised the "Thickness" of the material to use as benchmarks for the bags.
You can easily elaborate the qualities and the Cost to the Weight of the container.
Basically, get a container online and if it doesn't meet your Volume requirements use this calculator to extrapolate how much it will cost if it can hold more.
D6s can be very versatile as it can be a D3 and a D2.