His is over 3" deep. My regular Pyrex 9X13 would do in your case and indeed I have often made them that size, but it is also the reason I have changed my method . I even have a 12X18 pan, but that would be a LOT of lasagna--and it isn't really the right size to fit the noodles.
I make a 3 layer lasagnas--meat and veggie, they cook in an hour, and don't find them hard to eat. But in order to do that number of layers I have to use a foil restaurant half sheet pan. That is my preference for lasagna, hence my interest in Mario's pan. ;O)
I also think it would be an excellent pan for a lot of other things like roasts, plus very good looking.