Thanks everyone, and for the link TimA.  I also see that the Kondos non-insulated food pack has a decent sale going too. From the few comments by actual users of this, the BWJ system seems to work well, but $400 is probably more than I am willing to part with.  FYI, what I have done for years has been to fashion my own cooler (from rigid insulation), custom fit to the bottom half of my food pack, with my dry goods on top inside a separate trash bag.  The homemade cooler doesn't last forever, but I have been able to keep fresh meat & milk for four- five days with temps in the 60's & 70's, using the same cooler for several seasons.  I like the idea of plastic boxes for the dry items.  I think I am going to keep using some version of my existing system along with plastic boxes for the dry goods going forward, and probably just purchase a new uninsulated food pack.