I got one as an Xmas gift from a friend, and then went on eBay checking out what else was there. Got me similar short zoom one that has a removable hood and lens cover, its not insulated, suggested use is for holding pencils. Had to get the white lens mug model too, it even came with a pouch with Canon printed on it. Neato toys!
I checked eBay just the other day and now someone is offering a Canon zoom lens mug that actually zooms! Quite a bit more pricey that the ones that I got, think it was around $28.00. The two I got with postage were only around $21.00. Too bad I don't drink coffee, but they are great conversation pieces.