
The US Flag Code states "The flag, when it is in such condition that it is no longer a fitting emblem for display, should be destroyed in a dignified way, preferably by burning". As long as it is a respectful disposal it is acceptable. But, for your best options, allow an organization that does this on a regular basis to do it for you. Where you are located you should have no trouble locating any of the groups I am about to mention.
Girl Scouts of AmericaBoy Scouts of AmericaVeterans of Foreign Wars (VFW)The American LegionANY MILITARY INSTALLATION