Why take all that stuff?
Because I can, and it is how I store the tools anyway. No garage with a pegboard or big toolchest, just that tool roll, a space at the bottom of wardrobe for it and some spares/ tyres and a drawer of “I might find a use for that some day” stuff.
When I’m out on the bike it’s a combination of tire levers, multitool, tube, gel packet, tubeless plugs, puncture kit, valve cores, quick links, spare links, zip ties and 2 rear light batteries all in a water bottle, I have one for the skinny tired bike and one for the MTBs with the appropriate kit in. They live on the bikes with the pumps.
But when I go away I can just throw this in a car, or in the big backpack if I’m travelling by train. Simples.