Hi,
I would have to see what's actually in there.
I usually take a shell or a sweater in case the temp drops. I keep 3 helmet covers in a zip bag, in case it rains on a weekend ride.
I try to keep a small baggie for trash in there, so it doesn't get messy from snack packaging. One thing that may be middle age specific is my pill bottle. I keep a bottle with some Alleve, some tummy pills, all the time. When I commute I often carry a spare battery for my main light. Other than that, the usual stuff most practical cyclists carry, like a patch kit, decent pump, a cell phone, etc.