Ziploc brand bags have been a go-to for corn allergy people for some time now. Plastics can be an issue for corn allergies, but the particular plastic in ziploc bags was from petroleum and was not dusted or oiled with anything. I personally have been using Ziploc bags for freezer storage, cosmetic and utensil storage, packing while traveling, and even to package my custom processed meat. Well, as it turns out, nothing good can last forever, because there may be an issue with the new version of the Ziploc bags that hit the shelves a few weeks ago.
The new bags have an “easy open tab” and look like this.
In addition to the new closure, the bag itself is a different texture, simultaneously thinner and shinier, and a couple of the very, very sensitive folks have reported reactions to it. One of the people reporting reactions was also the first to notice an issue with the new Ball BPA-free canning lids, so I am minded to heed this warning and exercise caution. Around the same time as people started reporting reactions, i started having some signs of mystery inflammation that started around the same time as I started using the new bags here and there. I also added back the honey that I had run out of for a few weeks that had been safe for me previously around that time, so I have cut them both and will update this post if re-introduction reveals a clear culprit.
For now, I would not panic, just exercise caution with these new bags. If you are in a delicate health state or have delayed or hard to pin reactions, I would not try them until you have your diet otherwise stable so that you don’t get confused about what the cause of any potential issues is.
I have not done any work to contact Ziploc and find out what they say changed or not, I am only reporting reactions at this time. if someone does correspond with Ziploc and wants to post those results here, that would be welcome.
Update Feb 2017: A couple months ago I re-introduced the Big Tab ziploc bags and had esophageal swelling from all food that had been in one. Not safe for me. I can’t be sure if this is a corn issue or not, but they are definitely not okay for me. I have a stockpile of the old-style bags and am moving to glass pyrex or anchor hocking storage containers, mason jars, metal U-Conserve storage containers, and other reusable options when possible, and Reynolds brand aluminum foil when I absolutely need something disposable.