Save the large cups you get from fast food places, together with their to-go plastic cover and straw. You can wash them out and use them quite a few times more with your own drinks. (And you might want to take a few extra to-go tops with you, they don't last as long as the cups.)
By pam munro
Can I use melamine laminate paint on disposable plastic cups to make them re-usable?
By Denise