Used to work with a radio enthusiast on sailing ships, he’d make posts to social media and check his email literally 1000 miles out to sea via radio.

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• cut the neck off a plastic bottle
• thread the end of the bag through
• fold the bag open around the bottle neck
• close the cap, trapping the bag between the bottle neck and the cap.

I’m sure it works but any other method of closing the bag from the top two rows are better imo, at least for bread.