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If you're looking to hold any real amount of liquid, look elsewhere, but if all you need is something small, this guy works just fine. I'm a delivery driver, and about once a week I go up to deliver to a resort in the mountains, even in the cold winter, with the lid on he'll stay warm to hot for at least 4-5 hr, with it off for at least about 1-2hr. Haven't kept anything cold in it for too long, but it'll definitely stay cold for at least an hour. He only fits maybe 6-8 oz though, be aware. (About the size of a disposable paper cup) The quality of the materials are fairly good, and it actually feels worth the price (for MATERIALS, not size)
The one thing I did not ABSOLUTELY LOVE about this product it that the exposed stainless steel makes drinking hot liquids difficult because it stays scalding hot for a very long time. I usually transfer my coffee to a mug once I get to work.