Fu Store Ice Cube Tray for Tumbler Cup 30-40 oz, 3pcs Silicone Ice Cube Molds With Lid and Bin for Chilling Cocktails Whiskey Drinks Juice Coffee Easy Fill and Release Ice Maker (Black, 40 oz)

The ice lasts forever. I am thinking it may be because the ice rests against the stainless steel where ice cubes can float around, but it does last significantly longer than ice cubes. It does get pretty cold if you take it directly out of the fridge and immediately try to use the ice cubes.

Fills easy and keeps cool for more then 12-hour in my stanely cup love the color and durability also is as advertised dishwasher safe I recommend top rack.

If the silicone was a little larger water wouldn't get in the box when filling the mold. If you have trouble devolving the ice like I did, try using the diagrams in the listing. Just scroll as they're down near the reviews

Hubby was surprised how the ice stacked in my tumbler. I froze sweet tea in them. Nice!!!👍

The first time I used these, it was just a mess. If you fill up the molds outside of the tray, it’s too floppy to move. If you fill them up inside the tray, water easily spills down into the tray, which will make the molds freeze to the tray. The lid is not touching the top of the molds, so if you jostle it when putting it in the freezer, it spills and you have to start all over. I eventually got it to work by only filling the molds halfway up. The mold needs to have more of an angled edge and raised lip to keep the water in.

Great

Extremely love this very easy because bought others and this is the best one have three of them

When I first opened it, I wasn't sure what the bin was for. I thought it was an extra or something, and I was even considering what I would use it for in my fridge until I realized my mistake.As a first-time user of this type of mold, I quickly realized that after filling them with water, they were very hard to control without spilling for an average person. Then it hit me: That's what the bin is for.So, I managed to somehow put the mold with water inside it, but it wasn't easy.Okay, so the obvious advice: Fill the mold once it's already inside the bin. You would probably figure that out yourself, but if you are reading this before or after purchase, it's a good thing to know.To take the ice out of the mold let it rest for a minute or so, maybe in water. I broke mine, so be careful and patient if you want to keep the shape.I don’t have a Stanley cup; I used them in a Starbucks cup. Not sure if that is why they melted as quickly as any other ice or maybe just lasted a little longer. Maybe in Stanleys, they are supposed to last longer. But if not, it depends on each person if it’s worth the space it takes in the freezer. I'm going to decide that for myself the next time I use one in one of my spirits to see how long it lasts.