Here’s a good rule of thumb to try and remember.
Every time you are about to use disposable plastic/paper/etc. for something, think about how you could use something reusable or biodegradable instead.
Take plastic locking bags and plastic wrap for example. You can buy reusable zip top silicone bags, reusable bowl covers instead of plastic wrap or aluminum foil, or you can reuse things like old plastic Chinese food or grocery store containers to store things you would otherwise put in a plastic bag.
The great thing too is that both silicone bags and many reusable plastic containers are good for freezing food and storing leftovers or lunches.
Old jars are also great for food storage and come in many shapes and sizes.