My minimal FF travel kit is:
K-1ii
Sigma Superwide II 24/2.8
FA 43
FA 77
On my recent holiday visit to Michigan I brought the above, plus a Rokinon 14/2.8 that I didn't end up using and a Tamron 70-200 that I brought for a
specific single shot I wanted to get while there.
In addition I had my little aluminum Manfrotto BeFree tripod which I didn't use much but needed for that one shot with the 70-200.
This trip was not all about photography and I knew I'd be in the city a bit so I wanted to keep it small and light.
I'd really like something better at the wide end. The Sigma is ok, but with two other Limiteds in the bag it's shortcomings are fairly noticeable.
FA 31 would be a natural match but I want something closer to 20mm.