Work: Laptop bag. It’s not terribly small.

Outdoors stuff: Generally a Camelbak MULE, which is a midsize bag.

Long events related to my recombinant DNA: Either my laptop bag or a smaller bag for my tablet and a power bank.

It’s colossally unsubtle but I have a 5.11 fanny pack for when I’m out on a bike ride.

Most other activities, no bag.