Tips for people on the go
I believe almost everything can be frozen for future use. I have a small container in my freezer for the bits of avocado that can spoil if you turn your back on it, another for bananas, kale and so on.
Glass containers for better waste-free freezer storage
In my quest to avoid single-use plastic, I freeze all my food in glass containers & surprise bonus -- it's much more resistant to freezer-burn. My food (& plastic) waste has reduced dramatically with freezer-safe squares/rectangles (eg IKEA) for meats,