There are several ways of how not to break glass.
The first is oblivious, don't throw anything with force at it.
The second, is always protecting it from being hit. One way is, if you are cutting your grass with a weed eater, protect the exposed glass with a sheet of plywood. This is very inexpensive compared to a double pane glass, which at the average cost of $200.
There are films you can apply, that are very costly, but at the end the glass still breaks.
Remember, glass will always break, you must think ahead and protect it.