Just the opposite. If the lid seals properly, it won't come off easily. If you find a jar with the seal broken or the lid comes off effortlessly, pitch it. Two problems with rings staying on. 1) they tend to rust to the lid making it difficult to know if you've lost your seal. 2) if you get a bad jar, the jar can explode with the ring on.
I'm just thinking about the fact that I tend to knock things together in the pantry and it would be pretty easy to knock the edge of the lid of 1 jar with the bottom of another and pop it loose, not saying that it would be effortless, but I mean, that's kind of how you get the lids off to begin with, you take the ring off and hit or pry it off with something.
I use two methods to protect from my clumsiness. I put a fat rubber-band around each jar and where I stack them, I put cardboard in between them. For lid removal, I use my fingers and fingernails, but I have extremely strong hands. DW uses a church key.
I think your plan is good!
You can also use a butter knife. find where the thread is nearly touching the seal and then use the butter knife to pop off the lid
Is that the re-usable one? I haven't (obviously) but someone on my friends list (FB) uses the re-usable ones and likes them. Don't know if they have been out long enough to say how well they do long term, but for something that will be canned and likely eaten fairly soon they sound like a good choice so far from what he has said.
