When you are traveling or going to a picnic you need to pack some food like sandwiches or chips with you. But simple plastic carry bags don’t suffice.
I use Ziploc brand bags for this purpose. You can seal them and the food also stays fresh. Another alternative is to use a cling wrap for veggies such as cabbage, broccoli or greens and store in the fridge. If you know a Tupperware distributor, buy some containers as they are made from a very good quality of plastic that does not react with the food inside.
Aluminum foils are good enough too.