Can you make glass bottles without the plastic at the bottom? After 1 year of washing in dishwasher, there is mold starting to build that is visible, but can't be washed where the white plastic base hits the plastic bottle.
I really enjoy having two more bottles for my soda stream. I also like the clear design and the ease of cleaning these either in the dishwasher or with a bottle brush make them great for my busy life. They fit in my cup holder too, so I can use them as my water bottle for traveling. If I had to change one thing, I'd love them to be insulated!