I started off this morning searching for the answer to a question someone asked me recently that stumped me: “How many times do you have to use a reusable bag at the grocery store to cancel out the energy used to make the bag?” I had no clue and vowed to look it up.
There is no simple answer, I’m finding. One reason is that reusable bags can be made out of a variety of materials, and some are more natural than others. Take for instance the popular non-woven polypropylene (NWPP) bags which are recyclable only in some places, yet not biodegradable which means they can take “hundreds of years to break down in a landfill.” It also turns out reusable bags may contain lead and there’s been some studies that they may contain bacteria.
Some of this doesn’t surprise me. We live in a culture where news seems to highlight the scary end of things, and most everything seems to be bad for you. If you’re worried about the issues mentioned above, avoid taking the chintzier reusable bags that companies pass out for free and invest in the more natural type, wash your bags occasionally, or (and you should be doing this any ways due to pesticides) wash your produce well. You can also support women in other countries who hand weave baskets by purchasing a fair trade basket to use at farmer’s markets and the store.
Overall, I’m not going to stop using any of the bags I have. There are still many great reason to use reusable bags, and according to #24 on this list your reusable bag lasts about 700 times longer than a plastic bag. Paper bags take more energy to produce (a lot more, apparently) and are heavier than plastic bags so they burn more resources to transport. Plastic bags are cheap but are subject to photodegradation, meaning when they finally start to break down they seep into soil and waterways, contaminating required resources for life in animals and humans. And when they get mixed in with recycling they clog the machines. In some areas you can recycle reusable bags– just check with your city (for PDX) first.
My favorite carrying satchel still remains my trusty backpack, which is the easiest way to transport groceries while biking.