Hello Mit, We're sorry for the confusion. Originally, this dust bag was only available in a pack of 3. But now, you have the option to select under the price on the page whether you prefer 3-pack, 6-pack, 12-pack, 24-pack, and 36-pack. Thanks for asking! If you have any questions, you may call us at 1-866-994-8759 or you can send us an email at email@example.com. Thanks, Emerson Tool Company
Yes 2 -3/8
you don't. the vacuum will do this automatically using the negative pressure that gets built up inside. lay it around the outside, stick the top on, then let her rip. you can see for yourself after you turn it on and removing the top again. don't use this bag though - get the rigid one. these suck real bad (rips open causing dust to fly everywhere).