The BEST Way To Seal A Glass Jar 

Double the bag - double the brag :) Great tip, John, and great perfomance!

In Switzerland we enjoy on most marmelade jars a two-part cover: www.crowncork.com/closures-capping/innovations-closures/orbit-closure - It's an amazing everyday improvements, especially for older people (not John) with not much force in the hands left.

watched the linked video, looked like gran was having a seizure!

John, love the shirt! Wear it next time you and Mathias have a collaboration. ;-)

Same here. He's full of tidbits of useful information that he might think is common sense but isn't to rest of us :-) I'm learning a lot from these quick videos.

Or, skip all that and just use two layers of bag.

Colton Blumhagen what country you in, the uk is currently charging only

Canada, but in my case it's only a city ban.

There's always sandwich bags. 40 for $1.99 and already 2 layers.

I use both, I tend to machine and woodwork in SAE (most good tools available in the US are SAE, well it's easier to get good ones for less), and I do some CAD work/3D printing in metric. I fail to see how metric is easier. You need half of 7/8"- just double the denominator, 7/16". If you'd rather work in decimal, well that works also (it drives me crazy when it's impossible to machine stuff using SAE, the math ends up the same, most machining measurements are done in decimal). Honestly, I find metric tedious. In SAE terms you think of things in units that are appropriate and relatable to what you're doing. In metric that goes away for units that are easily divisible by 10. It's easier to remember the system, harder to use. No unit is about the size of something relatable and standard, (my thumb width is about an inch, my foot is about a foot, my stride is about a yard...), I have to come up with something in my head that is about that size that I know the size of and compare it or if I can't (and in the US you rarely see the dimensions of things in metric), or worse I end up having to use the SAE approximation and then convert it. Metric makes sense to me when you're doing stuff on paper (or on a computer), and maybe in some cases slightly easier, but is almost worthless when doing things in the real world. I would rather deal with an 8' or 96" board then whatever the metric equivalent is (you either deal with a bigger number that has more digits to remember as you're walking over to a saw talking someone, or worse, too many decimal places to get an accurate cut...)

I would argue that is cheaper, to build with paper than bricks. I like to make detailed plans before I set to build something, that way I have no mistakes, no discarded/wasted materials, no mental calculations to do while building. As for the very long decimals I just round them to the closest number. But I guess is just a matter of what you are used to work with...

I was just going to say that too. If you plan on the jar being sealed for any length of time, make sure you don't use biodegradable plastic bags. The lid might come off easy, but you might be dumping a bunch of plastic junk into whatever is in the jar.

"Illegal"? As in, you can be arrested for possessing one and / or trying to sell one?

lol, its not that bad. I think the law only applies to new plastic bags, and it only applies to stores; I don't know how the enforcement is done, probably a fine or something. The HDPE produce bags (and homedepot small parts/nuts/bolts bags) seem to be exempted.