And now for something completely different... On some walks I carry a large plastic tub (with sealable lid). This is because I often have crushable food that needs to be protected (eg, raw eggs, muffins, crackers, fresh cucumbers). I have a few sizes and aim to use the one that wastes the least space depending on how much food I need to carry. The tub itself weighs more than a bag, and does take up a little more space, but not much more. It's not for everyone. And certainly not for people that have boring food.
As the food gets consumed, the space in the tub can be filled with other (non-food) items.
It also doubles as a handy kitchen table - take out what's needed, put the lid back on, then use it as a table to slice cucumber, salami, cheese, or whatever, then lay out the wrap on it and spread butter, and place fillings, all on a nice clean table-top.
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This is probably the largest tub I've used (and notice the second and third tubs - behind my knee and inside the large tub). This photo is lunch time on day 14, and the Ryvitas and cucumbers were still crunchy and crisp. (On this occasion, I did also have a cotton shopping bag with other sealed dehydrated meals. Could not fit 15 days' worth of food in the tubs!)