I spend a lot more on on-the-go gear than office stuff.
* Tile Trackers
* Vacuum insulated water bottles, food jars, and a coffee mug
* A decent phone
* A MOLLE backpack(SOG Ninja) and accessories.
* A headlamp (Sofirn HS10, it's tiny and USB-C rechargeable)
* Zero drop barefoot shoes
* An ultra slim neck wallet
* An A5 6-ring planner for the rare occasions I'm using real paper
* Duplicate home and backpack copies of things like USB chargers
My latest purchase is some 1.8mm reflective cord.
Tied around a carabiner at both ends, so I can quickly clip my keys to my belt with one of those tactical belt hangar things, and ensure they don't fall out of my pocket.