Cup (mug or water bottle)
I don’t just mean at the office with your Sigg bottle I also mean when you go to the gas station, at a fast food restaurant everywhere. All of those bottles just build up in the landfills and are never recycled by the fast food companies. Many gas stations and coffee shops will gladly allow you to bring in your own travel mug. They will also let you fill up your water bottle with the water from the pop machine instead of buying a bottle of water. Think about where you can can use non-disposable cups.