For gears, I prefer many. The engine wraps out around 30mph in 1st.

Multi-tools, I probably only have 5 or 6 of those (and rarely use any of them). Flashlights are a different story. We have to have at least 30 of those suckers spread all over creation. Knives? I've got a ton, but generally stick with only one or two of those for regular use. Cars - the front of our house looks like a car lot. I'm more choosy about electronics. I often have a spare for the less expensive items, but as the expense goes up I tend to buy a better quality more reliable single version (when I was young I bought the cheap stuff, but not any more). Sunscreen - we buy that at Costco. So enough on hand to last us 13 lifetimes. They're all stored together in one bulging cabinet however, except for one each in the primary cars. AA batteries, we also buy at Costco. We can usually get that package out to the truck with only one forklift trip.