These are cute containers. The stainless part is a sleeve that fits over the glass and is held in place by a plastic neck attached to the bottle. The sleeve is a little loose and allows water to pass between the glass and the sleeve on the sides. It looks like there is a silicone gasket between the top and the glass. The lids are easy to use and fit the plastic bottle well. A good bottle brush is essential for cleaning these containers. It should reach deep corners at the top of the glass. A small sponge might also work. They are a bit more expensive but well made.
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