I split your comment up into two sections to point out that you basically answered your own question.

Reading everyone else's comments have given me some ideas.

I have a second bag for longer outings that I've been slowly working up over the past couple of years. It needs to be converted to a backpack and otherwise is a "work in progress".

One thing mentioned above was gloves. Yup, gonna toss a pair of those in there too. I have them in the vehicles, they should be in the "extended go kit" as well.