Wine glasses are foldable & portable- perfect for enjoying the outdoors, events, or travel but without the need for single-use plastic cups. They are completely foldable to make them easy to carry. Put them in your back pocket or use the included GOT certified organic cotton bag to stash it in your carry-on or backpack. 100% FOOD-GRADE SILICONE: Our silicone cups are built to last! They are made of 100% food-grade, platinum-cured silicone that is free of BPA and phthalates. They are dishwasher safe, freezer-friendly, and microwave safe. They will not break, crack, chip, dent, fade, or scratch.