Such a good idea, best of luck and can't wait to read the outcome! Would be super interesting to see a budget pack (an Osprey, Alps Mountaineering or a lower tier Cabela's guide pack) as a control/see what pack actually gives you best bang for the upgrade money. But totally realize this is going to take awhile so may not be really possible to add low tier options.
For specific tests, definitely would like to see waterproofness with and without a cover (could just be in the yard with the sprinkler for a few hours to be more controlled/not take another 3 months waiting for rain storms while on trips).
For specific tests, definitely would like to see waterproofness with and without a cover (could just be in the yard with the sprinkler for a few hours to be more controlled/not take another 3 months waiting for rain storms while on trips).