CAJUN ACCORDION DISCUSSION GROUP
And put a piece of thick foam plastic on top your accordion besides the stoppers, preferably on both sides, avoiding a direct hit getting at them ... Nout
I have that Peavey bag too and I find it works great. A little costly but well worth it.
I also have one, and I like it so much I will probably buy another.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=248-8754 get a separate bag for the beer