Quest for the Perfect Bag

I’ve played with a lot of different bags over the years to cart around my stuff. In the winter, it’s easy since I have pockets galore. But in the summer, if I don’t want to carry my backpack (and get my back all hot and sweaty), I need a smaller bag. I’ve tried satchels (and had everyone make fun of me for carrying a purse), camera bags, and the like but nothing has really worked for me. Maybe I need a The Pod.