Mainstays want to contribute to a better world by offering eco-friendly products and do our part one piece at a time to offer solutions to global challenges such as water and sustainable production and consumption. If you are eager to embrace an eco-friendly lifestyle; Mainstays is committed to offering environmentally-friendly products made with sustainable materials. If you are looking to change out your traditional tableware, these Mainstays eco-friendly drinkware items are sustainably made from 70% post-consumer recycled water bottles, are BPA-free, and are food safe. Made with you in mind, these stackable beverage tumblers are non-toxic and non-porous, so you do not have to worry about germs and bacteria. These eco-friendly tumblers feature a timeless and pleasing modern style with a focus on environmentally friendly materials.