Left Red Osprey daypack at Washington Pass hairpin

Left my red Osprey daypack at the Washington Pass Hairpin pullout yesterday, Father's Day, around 2:30 pm. There was a guided group being taught beginning snow travel. They were parked right behind us. We left as they were loading their vehicles. Don't know what guiding company as they all were in personal vehicles, no company vans. Stickers on their cars lead me to believe they are from Bellingham/Skagit area. Any help would be much appreciated. lots of valuable and sentimental (been through the thick and thin with me!) things in there.
Cheers,
Bill

Did not notice it today . Try Mazama Store 509-996-2855 or Goats Beard Mountain Store 509-996-2515 . Sometimes people drop found gear there . X

Thanks!