Thanks for your replies and insights. Yes it is a BIG container. I have the means to move it (here and in my BOT) and actually inadvertantly "tested" it when my sling slid off the fork of my forktruck and it BOUNCED! on the gravel (loaded). I actually think these are designed for air lifting and EXTREME use. I forget the name of the company that supplied the military with them but they are CRAZY durable and it looks like it was never used. I want to say it cost 4-6K new, so that will give you a sense of quality of construction.

Thanks Again, Ironwood