I'm drinking a lot of water, and I like it chilly. I re-use my water bottles, so Ice cubes just do NOT work.I got the silicone ones, but you cannot stack them, and they only make half-tubes.These trays are excellent. When you close their covers, excess water bleeds out the tops and you end up with complete cylinders of ice that fit in any bottle. and because they are covered, you can stack them and they don't splash all over when you bump them. Just pull the cover and a tiny twist/flex -- getting the ice out is easy. I bought 8 and they are well-used.The only glitch is they don't interlock or mesh when they stack, so a tower of eight can get...a bit wobbly.I love them and would buy them again In a heartbeat. VERY much worth the investment!I ordered the 16 piece and was sent only 8 piece. So instead of being able to make 8 trays of ice cubes I can only make 4. Kind of disappointing. Great concept though.Love this! Makes perfect ice tubes (?). Love that they have lids. Got 8 pk I love them.I find myself freezing my favorite beverages in them with toothpicks making popsicles for the kidsThese ice cube trays take a little getting used to. If you fill them too much they overflow, but if you don't fill them enough you don't end up with actual ice roles. Once you find the right amount to fill they work great.Making IceI LOVE these ice trays! They make perfect tubes of ice that fit great in a water bottle and last quite a while. Definitely recommendGreat product. Works as advertised. Easy to use.