We just took a 2 day trip, our cheapy Igloo 1 gallon thermos was filled with ice at 9am Wednesday and by 9am Thursday was just cool water.
I’ve heard the very expensive Yeti can keep ice for days. Are there any others that aren’t $130? That is a little steep for someone that doesn’t camp or hike. I can go back to refilling the Thermos each morning at the hotel ice machine if I have to. I should have done that yesterday.
The Stanley cups have a plastic lid that’s less insulated so they do melt ice faster, but around the house they are more convenient because of the straw; I’ll load them up with ice and fill up water, drink it, fill it up again, etc; the ice melts more because I am adding fresh liquid water than because of time.
The Hydroflask is amazingly insulated, it would definitely keep things frozen overnight.
I’ve had all of these for years, IIRC we bought a set of Hydroflasks for my wife and me, but she lost hers at some point. The Stanley cups were a gift a couple years back.
I just had the handle to my Stanley fall off. I emailed the company and they are shipping me a new one free (Stanley has a lifetime warranty I guess).
I have a Stanley 40 oz mug that is fantastic. I fill it with ice before school, pour at least 2 room temp teas into it over the course of a day and when I get to school the next morning, there is always ice left in the mug. If the rest of their products are that well insulated, go Stanley.
My wife had the 32 oz one and I had the 40, I believe.
She had a lid with a straw (one that pops out, unlike the Stanley which is more like a normal plastic lid with a hole and a regular straw) while I have the normal mouthpiece.
The only drawback to these sizes vs the 18 oz is that ours don’t fit in a cupholder in the car (but since the lid closes you don’t need one, the hydro can go on its side without spilling). The smaller Hydro does fit, I believe; but with how much ice I like to stuff into my water cup, I need a bigger cup so I don’t run out of water so fast.
The Stanley cups do fit in a cupholder - they’re thick up top but thin out right at the bottom. Which is good, because unlike the Hydroflask, they do spill if tipped over.
All the Hydroflask lids are interchangeable. I strongly recommend either a straw or the mouthpiece; otherwise it’s a bit uncomfortable to drink straight from the metal lip of the cup. But I did it for years before I bought the replacement lids.
FWIW the video below shows some ice left after 24-hours but yeah…I think if you want better performance it will cost more (jump to @3:00 in the video):
When I fill my Hydro all the way up with ice and cold water from the Brita in the fridge, I still have at least some ice the next day. If I’m chugging water and refilling it, the ice goes faster.
For my sons’ band camp, I froze three blocks of ice each in the deep freezer (-15ºF), put them in their gallon jugs, dumped in as much Ice from the regular freezer as would fit, and filled them with refrigerated water. Band Camp ended Wednesday. I finally conjolled them into emptying and cleaning their jugs this morning (amazing what not letting them have their phones will do), and there was some ice left (a chunk about as big as my fist). I stuck my instant read thermometer in one before it was dumped. The water was about 40ºF.
It is a hassle but you could always buy a few different ones off of Amazon (or a local store) and test them at home and then return the ones you do not like.