I don't keep roll-film cameras loaded...if I did, I guarantee it would be the wrong film when I went to use it.

(When my ship came in, I'd be at the airport)
That being said, I do have 10 4x5 film holders loaded .
I have a rule, never have loaded film. Otherwise here too it will wrong film or worse wrong.
With 35mm that's why I bulk load or even split 36 exposures canisters in 2 or 3 smaller ones. Also why my preferred 35mm SLR are the Exacta and the KMZ Start: they have a knife. Also why I carry a changing bag (provides extra cushion packed tight at the bottom of the camera bag) and small scissors, because rule can be violated when in a hurry or distracted or when the weather changes fast, so I may need by mid-canister to shot at 800 or 1600 but one hour earlier i loaded a 100 canister and took few first shots like that because there was sun.
I always have the dark bag, have used it with 35 SLR, RF, 120 folding, 120 SLR, 4x5 holders and I am buying an extra large one for 8x10.
the other day I was to load 8x10 holders, grab one, removed the dark slide for routine cleaning/checking for dust, and ... exposed the sheet that was left inside ... given the price of 8x10 sheets , not smart.... I have a rule for sheet film: always put a chunk of freezer tape to hold the dark slide to the frame, with the name of the emulsion on it, discard the tape when unloading for development. But it seems I forgot and violated that other rule....