My BOB is setup for all weathers so it has everything from zip off pants to polarflece thermasl and Gortex. and for the record it also includes spare boots, and even gators. but I live in a regon that if you have to, "bug out" your gonna be in the extrem cold during the winter, or the extreem hot during the summer.

And yes my BOB is very big, but that is what is great about having a truck