The kind of grip you use depends on a number of things.
If you're working a "Super-Pool" on CSX, where you can be called to any number of AFHTs, you can't just leave things in your locker at the other end. Not unless you have enough money for SEVERAL laptops and don't mind being caught with the wrong book available...I like to read one at a time.
Working Willard to Cleveland, all I needed was my rulebooks and a jacket and sunglasses. About 35 pounds in all. Manageable in a small Tuffbag (partitioned canvas duffle). I was able to drive home from both terminals, so I didn't really need anything but company requirements.
Working Buffalo to Willard, was another story. I needed:
- Shaving kit and medicines, for acid reflux, Immodium for spastic colon, insect repellent and sunscreen;
Clothing - two changes of underwear and a second set of trousers (very embarassing when your pants let go as you climb off the locomotive); also coat for weather changes and ice footwear to comply with safety regs in winter;
Rulebooks, about eight of them, as well as yard maps (never know when they'll be needed);
Flashlights - can't tell you how many times I've had motive-power failure in the dark and the engine-bay light was inoperative;
Tools - Leatherman; Templestick; Magic Marker; nylon ties
Food - you'll like as not be out for twelve hours; and then twelve hours the OTHER way. Plan ahead...missing meals is one thing that destroys railroaders' health.
Book or two for "pleasure" reading during those interminable delays, usually at the end of the day, because the relief crew wasn't called and the Yard doesn't want to be responsible for a "delay."
Laptop - because the typical hotel stay is 24 hours and longer. There's only so much TV you can watch before you wanna SMASH it.
Get the picture? You're going to NEED most of this kind of stuff. You're really going to be away from home and away from most conveniences for three days at a time...occasionally longer.
To carry all this, I could jam it into one extra-large Tuffbag in the summer. Winters I carried both the large and small ones, to carry winter clothing.