I try not to keep film loaded before I know the shooting conditions. That decides which camera to take and which film to use. Sunny needs a lower contrast film. Cloudy needs a higher contrast. Rain or snow needs a rig with good weather sealing.
On planning a trip to Greece in summer, I already know it's going to be sunny every single day so it's not a problem to decide my films months in advance. Here is my bag for this year.
Honorable mention to forum member
@MCB18 for the 220 Aviphot. I haven't had a chance to try it yet but it's in the queue.
2x Kodak Portra 400 220 expired 2013 @200
2x Kodak Portra 400NC 220 expired 2010 @200
2x Fuji NHGII 800 220 expired 1999 @160
2x Fuji NPS 160 220 expired 2001 @50
2x Kodak Portra 160VC 220 expired 2002 @50
2x Fuji Reala 100 220 expired 1996 @50
2x Shanghai GP3 100 220 fresh @50
2x Kodak Plus-X 125 220 expired 1997 @50
2x Agfa Aviphot Pan 200 220 fresh @100
3x Ilford Delta 100 35mm fresh
6x Kodak Ektachrome E100 35mm fresh