Last spring while on the Sinai a sandstorm blew in. Found out the relatively coarse zipper on the Domke F-5XB is not dust proof when the sand is being blown around by a +30mph breeze. To be fair to Domke & YKK the zipper was open ~2-3", but with the flap covering it. Dusted the GF-1 off with a rag and fine brush. Yesterday while standing under the wrong tree the same GF-1 and I got dumped on by a pile of damps snow. Temps were a few degrees above freezing. Quick shake to remove most of the snow left a few drops of moisture. No problems. Anyone else have their gear subjected to less than ideal conditions with no negative consequence?