I had a bad batch of 2oz bags. A dozen white and dozen black. The white were all fine but the black were 12 for 12 bad. I contacted Grove bags and they made it right but I went with different size bags for replacement to avoid any possible issues with existing stock. I've been through a lot of gram, 1/8, 1 oz and QP bags and rare if ever have issues. I used a vacuum sealer for just seal function and it works great but I wanted more convenience and got hand held sealer. But those seals are sloppy as all get out so I have dedicated 12" sealed in my cart on Amazon. I like to seal once humidity is stabilized for sure but once 40 days or so is up I like to cut off heat seal and use ziplock to dip in and out of bag.