Amazon.com.au:Customer reviews: 20 oz 6 Packs Wholesale in Bulk Insulated Stainless Steel Tumblers Reusable Coffee Travel Mugs with Lid Hot n Iced Cups, Double Wall Blank Vacuum Metal Thermal (Half A Dozen, Stainless Steel)
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Our whole family loves these! They're a great size--not too big, not too small. They insulate well, and cold drinks especially seem to stay cold forever. Hot drinks stay piping hot maybe 2 hours (the lids probably lose a lot of heat), but unless you're going somewhere and sloooooooowly sipping your drink, 2 hours seems like it should be fine (I only know because I forgot about it once).
I would love it if the lids could close up the sippy part better, but honestly, for the price, I'm not complaining at all--just don't let it fall over and spill :)