You guys get along with so little. Here's what I never leave the house without, carried in a Fjällräven Greenland size S bag...:
– phone (up until recently I had a tiny Nokia dumbphone for voice calls because it sucks when someone calls on the smartphone during navigation while on motorcycle...) – wallet with home and office keys attached – a metal ring coupled to the bag strap for car / bike keys – case for glasses if I need to take them off (rarely used though) – tiny knife that masquerades as a bottle opener – bag with USB charger, power bank, assortment of short USB cables for all occasions, Arch Linux boot stick – a pen and a couple of permanent markers – travel toothbrush – lighter (I don't smoke but it makes me friends) – some lucky charms: gemstones picked by my daughter tied into a 'sausage' with some stretch fabric – T1D stuff: insulin pens in a gorgeous leather roll made by a friend - glucose meter with accessories - bag with pen needles - plastic jar with lid for used needles - pocket scale for weighing stuff to calculate carbs - glucose tablets and Skittles (great for microdosing carbs)
Not in shot: wrist watch.
The Greenland bag is pretty nifty. I've been using a standard Kånken but it's slightly too large for my needs, and I thought about downsizing. That seems like just the right size, as it seems like you still manage to carry a fair bit but it's not as bulky.
Love the Arch stick, lol.