I will stick with the idea they are great for 'grab & go' storage of some key items and would be great for transportation and/or handing out to someone in need.

However, when deployed they become cumbersome and it will be difficult to manage the individual items - thus I still think a bag is better so you won't have to unpack half a tube to get to the element you need just because it is in the middle... with the bag all your gear is individually accessible and for me that's better.