Ditch Plastic!  These light weight stainless steel pint cups are an excellent inspiration to ditch plastic.  Bring your own and enjoy a new sense of awareness as you stop creating trash.  Easy to rinse, hard to damage.  
"I throw one in my bag daily, stuffed with an apple or other snack it takes virtually no space yet I always have that cup to fill.  It encourages me to find water instead of buying sweet drinks as I am on the go"