Flight search engine that includes luggage fees and flexible dates?

[fuzzybabybunny]

A lot of the flight search engines are frankly junk because the cheapest results you get might not include ANY check-in luggage allowance while other result in the same list that might be more expensive do include luggage allowance. This obviously destroys the comparison.

Does anyone know of a good search engine with flexible dates that at least shows an airline's baggage allowance in a "more info" section or something? Kayak doesn't. I think I have to select a flight and already be in the process of booking before I can find their list of luggage allowances.