I am constantly digging into my FAK for boo-boos, mine and others. Once, while waiting to pick up my daughter from pre-K, her classmate's very attractive mom was stung by a bee high on her inner thigh. I had my FAK out so fast I'm surprised I didn't trip and fall on the way to be of assistance. Disposable ice packs are often used and replaced.
Flashlights and multitools are the next most frequently-used Items in my BOB. I carry several contractor bags, and those have saved the day for various trash-related crises.
Batteries regularly are taken out and then replaced. Most everything else comes out only for the quarterly BOB check and review.