Protecting your investment
After using just about every comic bag and board they have made over the past 25 years, i made the switch 2 years to Mylar bags and Fullback Boards for my Investment comics. Now the First thing to know about these types of storage is that they are expensive and they should not be used for your weekly pulls.
All my Investment books that are not going off to CGC get the Silver/Golden size Mylites2 / Fullback bag and board for the best protection. The Mylar does not break down and is 10x stronger than the everyday comic bag and worth every penny to protect your investment.
Then those nicer modern books that you get , kinda get sad cause your older comics are looking so nice in their new Mylar home so get them the smaller size Standard size Mylar ... i find that the modern size just does not work well with some of the more beefy moderns and they have to squeeze in, which is not good.