I posted this in the visual guide to mylar sizes but why not here as well...
I'm not a fan of the one side coated boards from E. Gerber so I switched to the 56 point boards from Comic Pro Line. Unfortunately, as others have mentioned, the Comic Pro Line mylar bags tend to easily split along the sides so I prefer the mylar bags from E. Gerber.
Since I don't have a lot of GA books (the horror) - I've started to use the following combination:
E. Gerber 725M2 Mylites2 (7 1/4 x 10 1/2)
Comic Pro Line Silver 56 point boards (7 1/4 x 10 1/2)
I've found this combination (E. Gerber bag and Comic Pro board), is not as snug as just using the bag and board from Comic Pro line. Also, for those that care, the flaps on the Comic Pro line bags are larger.
Beautiful! Hard to see the bag but who cares.