Maybe you should take the chips OUT OF THE BAG before eating them.
This is BattleHymn's recommended strategy as well. At least the noisiness would be limited to a shorter period of time.
Alternatively, you could open the bag once after purchase and transfer the chips to a relatively noise-free gallon-sized zip-lock bag or something instead. Of course, that would kind of the defeat the "eco" advantages of the bag in the first place, wouldn't it? Typical unintended consequences of liberal do-gooder-ness, making things worse.