These Amber bottles are glass and and have worked perfectly for me. I like mostly the way that they seal shut by which making whatever I make weather it is home made beer, wine, tea ect. keeping it fresh as can be for as long as possible. The seal on these is so effective that I can seal up and bottle of home made beer and place it in a gift box ship to my aunt and it'll still be sealed fresh as can be and no leaks. I totally trust these bottles, I make a lot of home made drinks specially for birthdays holidays and such, I end up shipping out several for my family and these have worked vary well. They keep well in my fridge too. I confess i've dropped them a couple times on the floor and they did not even break which is a vary good sign when it comes to the actual quality of them. there for these are vary durable. I also wash them in the dish washer with zero problems. great price great quality. point blank I am totally happy I ordered these and so are all the people in my family that get to enjoy these as well. also they are rather easy to seal, takes just little pressure pushing it down but not that hard really. simple enough for my 78 year old grandmother.