Originally Posted by vrkelley
You can a a few zip ties to attach the bag so that it can't be easily lifted. As for the bag contents...nothing is fool proof. However, making the bag is difficult to open for the "inexperienced" that in itself may be a good deterrant.
I've done exactly as described above and have never had anything stolen. Of course, this is for short trips into the store, etc. If I were going to leave my bike for more than a few hours, the bag would be with me.