Better options for sandwich bags involve avoiding clingfilm, which is not accepted by supermarket plastic recycling bins, so it has to be binned, and ends up on landfill. And because plastic is made from oil, it’s a non-sustainable product. Many litterbugs drop sandwiches on the ground.
If wrapped in clingfilm they can harm pets and wildlife (cooked bones or eating plastic). There are also concerns over health, for wrapping sandwiches in plastic, due to hormone disruptors, which have been linked to everything from cancer to infertility.
The problem with ‘biodegradable sandwich bags’ is that (like balloons) they take a long time to degrade. So if someone discards them on the ground, they can still harm local wildlife. If You Care Brown Paper Bags are packed in cardboard, and made from microwave-safe brown paper, so ideal for heating up pasties.