I think it makes sense. In the car I keep a bag with a sewing kit, torch, extra batteries, travel toothbrushes/toothpaste, first aid kit, hairbrush, wet wipes, deodorant, salvon, suncream, bottled water, screwdriver, pliers, big heavy novel (currently War & Peace), note book, pens, charging cable, spare underwear and socks, a pack of cards, chewing gum, tin of hardboiled sweets, plastic cutlery, travel chess set and so on.
It lives in the under tray in the boot and has come in handy many times.
All my handbags also hold tampons, pain killers, plasters, antiseptic wipes, notebook, pen, small hairbrush, mirror, chewing gum, mini sewing kit, hair bands, £10 in a separate purse, sunglasses, tissues and dental floss.
I love bags with lots of pockets.