I am thinking of getting a vacuum sealing device to help with my food storage. Can anyone give me tips or recommendations? I would want to also be able to pull a vacuum in a canning jar, for some of my dehydrated things - I've read that this is possible, but any of the vacuum sealers that I've looked at in the stores don't seem to have (or at least to advertise) that option. I assume one needs some sort of added attachment, but will that work with only certain models? I am quite clueless about these machines, so any and all information will be helpful. Thanks.