Ziplock freezer storage bags, I use three at a time for a single bundle of cigars when I need to freeze. Freezing WILL result in loss of some flavor, so you have to decide whether or not the precaution is worth the sacrifice. I only freeze when I see definitive evidence of beetle outbreak. The moldy ones are cleaned off and smoked immediately. I find some cigars don't smoke as well after freezing, and others taste like crap, but it also depends on how the retailer stored their stock prior to your purchase.
Some other things that I thought I should mention although it doesn't answer the question directly, but addresses some of the concerns.
In the MRN book, he states that the beetles need sufficient conditions to gestate, and one of them is a good supply of oxygen (pp 280). However aluminum tubes strictly control the air/oxygen that the cigar is exposed to, and supposedly have a higher chance of stunting beetle eggs from hatching, and if they do hatch, the outbreak is contained within that tube (hopefully, unless they can chew through aluminum). Sounds logical to me. So maybe tubes are the way to go for the warm summer months.
On a plus side (referring back to the MRN book), he states that the high temperatures help to break down the ammonia in the tobacco faster also speeds up fermentation and makes the cigar tastier in a shorter amount of time (pp 6). However, this quick fermentation doesn't seem to be as beneficial as if the cigars were fermented slowly.
