Difference between 2011 and 2012 Montbell

[waldick]

I found a place selling the 2011 version of the
Montbell Super Spiral Burrow Bag #3 at a substantial discount....i wonder what the difference is ?

[waldick]

So after calling the manufacturer the difference is one ounce of insulation, the 2012 bags are all about an ounce heavier to live up to the "EN" rating. Otherwise, the 2011 and 2012 bags are identical....