The unfortunate part is that it rained indoors and directly on my backpack.
Summer is theatre maintainance time, there isn't much time during the regular season to do much of the work that needs to be done to keep the theatre in tip-top shape so with that small window of time there are all sorts of workers coming and going. I was up in the grid of a theatre retrofitting some rigging hardware at the same time as technicians were testing the fire alarm system.
They screwed up and triggered the fire curtain, which is a big, heavy fire retardant curtain made out of woven fiberglass that automatically drops in the event of a fire and creates a barrier between the stage and the seating area of the auditorium to protect the audience from fire, smoke and falling debris if a fire were to happen on stage. Not too much of a big deal, kind of a pain to reset, but no one hurt, nothing damaged.
Then the deluge sprinkler started, 2000 gallons per minute directly over top of my synapse 25 I had left in the front row of seats, this went on for about 10 minutes before they managed to shut off the sprinklers. I went into the house and fished out my poor soggy bag, most of the water had beaded off, there were a few spots like where the seat touched the bag that the fabric was a bit damp but besides that not too worse for wear.
And the best part, and probably what everyone reading this is wondering. Everything inside... BONE DRY! :D
Thanks TB for making such awesome close enough to waterproof bags!