I put my case on a scale last year. It weighed 43 pounds.
Yes, pounds.
For my as a Mesa CRJ Capt, I need: 1 company manual, 2 RJ manuals, flashlight, glasses, and about 3 full binders worth of Jepps. How much of that do we actually use? Little, but like the FARs say, you have to have it available.