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I buy all my bags from my local comic book dealer. If im buying a bunch of stuff that day, he'll throw in extra bags and boards for me for a pretty good price.
Ive always been sketched about buying them online because Ive heard other people say they didnt fit either.

I just ordered a case each of resealable bags and boards and they all seem to be fine. BCW brand, ordered from here: http://shop.hobbiesdepot.com/

The offer two different "widths" on the bags.

I have just started to change all my comics into mylar bags, i have the bags and i have the boards, what i want to know whats the best way to seal the bag are there certain tape's you cant use or shouldn't use , I don't want to just tuck the flap in.
Any info is appreciated thank yo

I order from BCW directly and TCBulk both just depends what Im ordering and how much, Ive also started messing with my FoodSaver with my comic books(ones I have framed on wall) I cut off the flap on the bag put the board in it put the comic on the bag not in then place it all in a food saver bag and then I vacumn seal it then use the heated sealer strip to get it closer to the edges then trim off the excess. Comic is now hard as a board almost and air tight and does not touch the board only the bag. As far as tape I tend to stay away from the glossy stuff as Ive had issues trying to reopen with the glossy stuff the matte finish is what I use.

You use a foodsaver machine for your comics? If you want the best protection for your books use Mylar with acid free backing boards,if you want more protection use a toploader too.Comics have to breath,the paper off gases.Even CGC cases aren't air tight just for that reason.