It could have been worse, you just lost 'things'. And you never know, you might just get it back. Did you have a name, address, phone no in the bag?
Riding with my wife a few years back, we go to the top of a long hill and stopped to rest. A while later, off we go, down the other side. At the bottom of that hill she realises she doesn't have her helmet. So Back UP the hill to find it. It's not there. WTF? It turns out she never had it on when we started the ride.