IMHO, there is no limit to the size of an emergency preparedness kit. Some have pocket kits that are carried daily, others carry larger kits in their cars. Some have vehicles with enough stuff to last a month and others have out-of-town-cabins outfit for a long term stays.

I've spent the last 5 months acquiring the right quality equipment for making four large bug-out bags. Their primary design is to help a young family of four, get out of the city quickly with food and other emergency equipment all in one bag. Each kit is in a roll-around backpack and weighs forty pounds, inside the roll-around is a backpack and belt packs so the materials can be split up into smaller groups should the need occur. These bags include water, food (MRE's) for three days and hardware to set up camp for longer term (weeks). All of the bulky stuff, like the poncho liners) have been vacuum encapsulated. Everything is marked in groups within heavy zip lock bags.