Hoo, this is an easy one.
In my old age I now favour minimalism in almost everything in my life. This is a major sea-change for me, as my previous #1 life principle ran along the lines of "excess in moderation in all things".
I am now 90%+ digital but if I had to make do with film, it would be a Contax G1 with a Zeiss Biogon 28/2.8 - the lens I could easily and happily live with for the rest of my life. As a second choice the Zeiss Planar 35/2.0, but for me the '28 wins.
The one downside for me with this kit would be the size of the container(s) of film I'd have to carry. For several decades I traveled with Australian Army field ration metal cans, each can holding 20 35mm rolls. Two cans of this would be considerably larger and bulkier than my G1 kit or even my Nikon D800 travel kit.
As for digital, this conundrum has again surfaced in my life as I'm planning and preparing for two weeks in Peninsular Malaysia and Sarawak in the spring. For this journey I'll take my new (to me) Fuji Xpro2 and the super duper Fujinon 23/1.4, the older lens with the manual focusing facility.
This Pro along with two changes of clothing and a few bother asic life essentials, will easily get me into carry-on luggage when I fly - my ticket to Kuala Lumpur with Batik Air allows for 10 kilos of cabin bag, and the Fuji won't add much to my total weight. Alas, the Contax G kit along with film cans would push me to more than my allowed cabin bag weight, and possibly create problems. So digital wins out on this trip, for this reason alone.