I took LB with me this am to run a couple of errands and of course, it started to rain. I've not treated LB with anything and I was afraid it would spot! So even though I tried to protect it when I ran for the car, it's a BIG bag and it got wet and pretty spotted.. I'm VERY pleased to say it dried nicely, no spots, no indication at all that it was ever wet. Total thumbs up on this bag, looks like it's going to be a great workhorse.