I use these tumblers to store smoothies in the fridge before using a straw to strain them into an insulated mug. They're strong enough for the price and seal well enough not to spill if the fridge is knocked over. The thickness corresponds to the price. Used quarts of yogurt are free and do pretty much the same thing, but I love that I can see what's in them. I also like the measurement markings on the side. Revane, I don't know how to rate "warmth". This is not the feature I'm looking for in a storage case. Of course, these containers don't have insulation, if that's what you mean.
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