Well, I brought my Le Pliage on a sightseeing trip to use in case of rain and the brown stripe bled on one of my white cardigans, ruining it. Very dissapointing, especially since I had the bag custom made on Longchamp's site, especially for the trip. I thought it would be cool to choose the color of the bag and stripe down the middle, and have my initials heat stamped on the flap, but all of that cost extra and now I'm hesitant to use it again, especially when wearing light colored clothing.
My usual go-to rainy day bags are my LV epi leather alma, LV suhali leather lock-it, and LV mono batignolles. Rain rolls right off all of them.
This bag is not everyone's cup of tea but for the rain (and I mean torrential rain days) I use a Furla Candy Bag in Red Glitter. It is a bright colored bag, and because it's rubber I don't care if it gets wet! It carries everything and a compact umbrella too.