I like making things modular and then nesting bags when I can and/or appropriate.

My urban kit (which just saved my butt from a downpour after my umbrella exploded!) is a small shoulder bag which I can wear along with or put inside a the small backpack I take when I go out for hikes. This kit contains several of the items I take backpacking and so I slip the whole thing inside a 60L framed pack when I go backpacking, adding only the additional items I need when I'm planning to be out several days but still having basically the same emergency gear and basic essentials. I also take the hiking or backpacking pack when I go car camping, ice fishing, canoeing, etc. as it makes fantastic backup when something fails or goes wrong.

Within these packs nearly everything is in seperate kits and/or dry bags so I can shuffle stuff quickly when I need to.

This creates a certain amount of redundancy which I like for days like today. It might be overkill in some spots but it only adds a little weight. Through careful planning, attention to detail, and OCD worthy levels of 'living room and bathroom scale' testing, the total weight on any of these is not excessive even when fully combined.