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Question: Can I vacumn seal canning jars in this?
Document: I've switched to large Ball canning jars for my coffee. Much cheaper and seal tightly.
why do I have to buy three of these to keep a large bag of coffee? like the vacuum pump , good seal, nice cannister,  I just wish It Was BIGGER.
vacu saver does not hold constant seal beyond 2 days. I ordered 2 and one holds no seal at all...Both were returned. These did not work as advertised for me.
This is a perfect solution to the need for vacuum sealing. I had tried a couple of improvised ways to vacuum seal the beans, and they worked but were a pain. This is easy and works well.
I have been using this container for a few months, but since there is no reason for me to keep wasting my time pumping the air out of something that doesn't hold a seal, I'll be replacing it with something else, probably an OXO Pop container.
The vacu vin holds a great seal which has already lasted over a week.It is a great product.I think I will buy another one since the product does not hold rough beans. Only  downfall is that it does not  store more.
I am still  finding uses for this. The pump can be used in place of Foodsaver pumps. A couple of strokes and the seal is just as good. Just buy the zip Foodsaver bags when on sale. Why waste money on an electric pump or vacuum system.
I typically buy the 12-ounce bags of coffee (such as Starbucks), and those fit inside of this size container just fine. The advantage to keeping it in the bag, IMO, is that it keeps the container cleaner and there isn't the risk of loose coffee coating the rubber seal on the lid.
So far so good. I have found a cheaper alternative in the Food Saver T02-0052-01. I had planned to use the hand pump with the food saver product but it did not seal properly. So I just suck the air out of the Food Saver and it works great.
If you don't feel increasing resistance to the pumping action, you're not forming a vacuum. In this case, either you don't have a good seal between the pump and the valve or your gasket has paricles on it (see above). I generally use the product daily, but I've had the vacuum hold just fine when I've been away for several days.
Answer: Nope. The Vacu Vin pulls a partial vacuum, which I don't think would be adequate for what is required in canning.  Certainly not worth the risk!  Its really just for keeping coffee beans a bit fresher longer.