Gladware is fine. All you want is the air/moisture tight seal.

Spanish cedar is regarded as the best because it can absorb/release moisture without warping, as well as keeping a stable humidity/temperature. Although spanish cedar can absorb flavors and release them, it's negligible, to my understanding. the flavor seeping that the our fellow botl's are talking about is from the flavor of one cigar mixing with another. So keeping flavored cigars and non-flavored separate is a good rule to follow.

I've never heard of flavored cigars "screwing" up a humidor other then it absorbing flavors of flavored cigars, thus passing those mixed flavors into your non-flavored smokes.

I've never seen a humidor lacquered inside, I'm not sure what DW means here. I'll let him answer that one.

Carrying cases will not effect the taste of your cigars themselves. And since they are usually used only for short periods of time, mixing of flavors from the cigars themselves isn't an issue. If you only need to carry a 2-3 out for a night, get a leather case. Doesn't matter what price as long as it prevents your smokes from getting crushed. And make sure you get one that will hold the largest ring size that you smoke. The larger the better, you never know. If you want a travel case for 5-15 cigars get an otterbox or something similar. Those are airtight and waterproof and will not effect the taste of your smokes.