Smeaton, I travel every week for work. I take two, sometimes three. Usually not my best ones. Loaded for this week, my trusty Pete harp 999 (my go-to pipe for Va/Per and the usual stuff, goes with me all the time, gets cleaned on Saturday, rests on Sunday), then I take one pipe from the set I dedicate to Aro's. This week my Sav 616 tevere. The third one is just whatever I fancy or a new-break in or something. Then an ounce of two or three baccy's. One open tin, usually a flat one like erinmore, golden sliced, etc... The Larger tins are too big in my carry-on.
When I used to backpack, which I did for years, one solid pipe that could take a beating, one spare pipe, enough tobacco to last for a week or two (which was four pouches of Drum, Ajja or Amphora for me back then), zippo lighter and fuel (in a thick ziplock bag, wrapped with rubber bands.. It only needs to spill once and you'll remember :rofl: ).
Now, when weekend camping, one pipe, one baccy (two to three ounces), one Bic lighter for the weekend.
Hope this helps.