Oh, I noticed basically everyone at work has a personal backpack they bring. What all would one put in such a bag? Things like extra deodorant, socks, snacks, (my switch), etc?
Depends, what kind of shifts are they? 12 or 24?
24hr shifts you'll def want some basic toiletries (toothpaste/brush, deodorant, etc, shower stuff if available), change of underclothes, and yeah, things like tablet, charging cables, etc. 12 hr shifts you can eliminate any overnight stuff.
My duffle bag contains a bunch of clothes (2-3 t shirts at minimum, PT that-that you prob dont have to worry about, shower and toiletries, plethora if charging cables my Kindle, power bank, I even started carrying my Fire Stick, a set of bedding normally lives in my locker that I need to grab when working at other stations....
If you're living in the ambulance on street corners for 12 hours at a time, I'd leave spare clothes in your car, maybe keep one spare undershirt (but always have a spare regular uniform at least in your car/locker at work, prob no room in the ambo to keep it), but for street corner postings, a good car charger with long cord (spend the extra bucks on a fast charger not a cheap 7-11 charger that'll wear out in a week or so and take all day to charge lol), snacks and the like, water, a book, copies of your protocols/area maps to study