While I have been enjoying cooking from scratch on board Mahalo, I also like to have meals prepared ahead of time. Especially for lunch, when we are underway. I bought this Food Saver vacuum bagger from Amazon, and I really do like it.
Besides pre-made bags, it also has a tube-roll that allows you to make bags of any size.
Here we have two of my black bean burgers. With no or very little air left in the bag, the freezing is superior to any other method. And you only have a small amount of trash after you consume the food.
Soups & stews & bolognese really are great for the underway meals. Defrost the night before in the refrigerator, then put into the InstaPot before getting underway.
I have been buying uncooked shrimp already frozen in a bag, which contains about 30 shrimp. . Sealing portion sized amounts means less air to turn frosty in the bag.
I don't take the FoodSaver itself on board, it's kind of bulky. It was about $150, money well spent.