There are probably hundreds of different bags used by the pilots. Many use the airline style tanks to withstand the road abuse. Many use Briggs & Riley 22" rollers (very nice with a lifetime warranty, but also very expensive). Costco 22" bags used to be popular until they were discontinued. TravelPros are pretty popular. I prefer a lighter bag and typically get 5 years or so on a TravelPro or other sub $200 roller. For a secondary bag, I use a backpack that fits under the seat in front of me on the airline, but can expand a bit to carry a bunch of waters or whatever for the overnights, along with all the cockpit stuff and personal electronics and reading materials. You will quickly find what works for you.