Do Green Bags work? Well... they probably do lower the levels of ethylene inside the plastic bag, so if you are comparing how long fruits and vegetables stay fresh in Green Bags as compared with other plastic bags, you might see an improvement. Or you might not, since ripening is not necessarily why produce spoils. Strawberries and raspberries, for example, usually mold long before the fruit itself goes bad. Most produce really shouldn't be stored in plastic bags, so if you really want to extend its shelf life, leave the produce in the open (tomatoes and bananas) or use paper bags or loosely-wrapped damp paper towels. Some people have reported good results with Green Bags for certain types of produce, such as apples and peppers. I am unaware of anyone who has gotten the bags to preserve produce for the full 30 days.
Would I buy them? No, because my kids eat everything I bring into the house within three days. If I didn't have kids and if the bags were effective, then I would consider the expense. Generally speaking, however, the shelf life of most produce is reduced by storing it in plastic, zeolite or no zeolite, because the humidity inside the bag is so high. You can help your produce last by keeping it cool and by allowing air circulation, which naturally reduces ethylene and other plant hormone levels in the air.
Have you tried Green Bags? Feel free to post a comment to share your experiences with other readers.