Consider using backing boards for your original art too. Bags by themselves don't offer rigid protection like boards can. I highly recommend using 2 mil Mylar-D bags, backing boards and microchamber paper to protect your investment in original comic art.
Our original art frames come with a 2 mil Mylar-D bag, backing board and one sheet of 11x17 microchamber paper. The backing boards are cut to precisely fit Egerber bags and actually measure 11.25 x 17.25. The mc paper is about 1/16" less than that both ways.
I'm often asked about using 4 mil bags because of their increased stiffness, and although they are more rigid than 2 mil bags, the thickness doesn't allow the flap to fold over. The biggest concern about storing comics and original art is exposure to fresh oxygen. If it doesn't have a closable flap or can't otherwise be protected from the open air with a container of some kind, then destructive chemical reactions are taking place inside the paper.
Even with a 2 mil Mylar-D bag with a foldable flap and acid-free backing board, you want to absorb acid by-products over time with a single sheet of microchamber paper between the art and the backing board. All paper material will biodegrade over time. Do a search for some silver age original art and you'll see what I mean. Off-white can lead to yellowing and then to browning and finally brittleness and then flaking. Ewww... don't let this happen to your collection. Order now, before it's too late.
Be smart with your art investment and keep it looking pristine and acid free. I will sell bags, boards and mc paper in any quantity as long as you order at least one frame.
Note: It asks how many frames would you like? It should say backing boards. Select the number you want and then click add to cart.
Pro Comic Book Boards offer a smooth surface to pencils and inking with a brush literally glides across the surface (quill pen not recommended). Pro has offered thousands of artists the opportunity to begin their careers on pre-printed paper like the professional publisher's use. Learn more about these boards!
I am pleased to offer the highest quality Mylar-D bags, the same type used by the National Archives and the Library of Congress. Not commonly offered, they preserve for 100 years instead of the usual 3-5. Learn more about these bags!