Actually a pretty good idea, it will save on the really L-O-N-G spoons. I hope they dont make them child proof though, I can never get those damn things open.

First, This is useful... How?

Why?
IMO Because a one-lidded jar has only one point of (potential) failure outside of the jar itself breaking.

With this you've probably more than doubled it if you're storing liquids, considering the lower lid now has to seal that stuff in directly as opposed to making an air seal.

That being said, it would probably be good for gelled stuff to break the vacuum holding it back from being dispensed, ie: cranberry sauce.

I saw a drawing for a double sided jar in a MAD or Cracked magazine once, as a joke, but I thought that it was a pretty good idea actually. Damnit, I should've patented it. >_<

this adds a whole new spin on the sugar/salt joke where you loosen the top and it spills all over.. sweet

@strider_mt2k: I don't think anyone is going to be storing there anthrax reserves in here. In all likelihood the bottom screw will be sealed by the manufacturer and only opened when the jar is near empty. But then again, that means you have to add a whole another layer of safety seals and bull crap, so its really just a slight-convenience-large-waste.

I'm a fan of the upside-down ketchup bottles (where you need to give it a little squeeze to come out). The others that rely on gravity are alright, but sometimes eject their goodness too fast/before I'm calibrated/locked on target

Great idea... but why stop at two lids? Jars of the future will be nothing but lids.

One time some salsa spilled in my fridge and collected in the bottom below the vegetable drawers. By the time I discovered it, it had become a homogenous black sticky nasty mess that took several hours and a garden hose to finally get clean. This jar reminds me of that for some reason.

@Darrone: Look man, IT'S SCIENCE! :D

You put your weed in it

Why not just turn the jar over when it gets low? This reminds me of using a pencil in space instead of spending millions developing a pen.

Give me a break. There was a seven year old who had this idea on Figure it Out back in the 90's.

I'm starting to think Yanko's quit trying or something...

I can see it being good for stuff that is otherwise hard to get out of the bottom of a jar. Peanut butter, marshmallow fluff, etc.

@Darrone: @strider_mt2k: Naw, it's just designed for both optimists AND pessimists: Those whose jars of peanut butter are either 1/2 full, or 1/2 empty....

Holy shit. When i saw that picture it was like a glimpse of the future. I may have peed myself a little bit in the awestruckenness of simplicity and the why-didn't-i-think-of-that-ness of this invention.

@AlbertaLark: I remember reading an article about that whole pen/pencil thing a couple years ago. Was that true?! i thought it was just a joke!

Newly inspired ideas:

Beer cans where both sides have pop-tops. This way you can chug without puncturing a hole in the side.

A funnel that goes from wide, to skinny (as usual), then gets big again. I've yet to figure out a purpose for this though...

@Ghinn: Indeed.
It does take Fluff to make a Fluffernutter.

@AlbertaLark: Please tell me the brand name of the runny ass peanut butter that you use so I can steer clear of it. Thenk yew.

Put it on the shelves and let the market decide. I think it would have its uses.

How about a partition in the middle of the jar? Kind of a two-pack. (Insert dead rapper joke) Or put PB in one end and J in the other? Kind of silly, but I bet somebody'd do it.

This defeats the old "screw the lid under a board to store hardware" trick.
All your screws belong us!

@Zaxxon Q Blaque: All-natural peanut butter could be considered "runny", but it's also delicious and the only PB worth eating.

Once you have it you'll never go back to that processed peanut paste they call peanut butter.

Is it that hard to get the last bit of peanut butter out of a jar? The last time I remember scraping every last bit is when I stuck a slice of bread inside and use a butter knife to swirl it around.

Or I could have just microwaved it and let it drip out.

Why stop at two lids? I predict lid escalation like with razor blades.

@AlbertaLark: The "million dollar space pen" story is an urban legend that really needs to go away: [www.snopes.com]

@bobman1235: Well, if it just came from the fridge like mine, it gets a bit solidified hence the microwave solution.

@bobman1235: Actually, I like almond or cashew butter! ^_^ Mmmm, now I want some...

Peanut butter still comes in breakable glass jars?

@Ghinn: They do make a special knife/spreader for getting peanut butter out of the jar. Whatever's left is removed by the dog's tongue.

@combat chuck: Yes. Yes they do.

@edosan:
@edosan: The space pen really did cost millions to develop, the only fallacy is that NASA paid for it. Graphite pencils are actually too dangerous, instead they used grease pencils previously. @ZaxxonQ: Start storing your peanut butter upside down all the time and tell me what happens. By the way, who still gets their PB in glass jars, or who has been so desperate for PB that they broke the glass jar?

@combat chuck: And the really good stuff comes w/E. Coli and Salmonella.

@AlbertaLark: "Try new delicious Runny Peanut Butter! Now with less choking hazard! No need for double sided lid jars! Safe to drink! Quenches thirst! It's easy to see why I choose R.P.B.! ^_^"

I actually saw this invention on Jay Leno at least 10 years ago. It came from a little girl at a science fair, she won a free scholarship to damn near any college she wanted to go to.

@discounteggroll: That's what she said.

Twice the price of production, sweet!

I had recently put together a little sealed ecosystem in a mason jar with a mild UV lamp, filled with java moss and algae with a few japonic shrimp. So far the whole setup's been alive for over a year, but man was it a bitch to arrange nicely before flipping upside down in the jar. This would've been helpful =D

Start selling PB in hummus containers and there won't be a problem. Isn't selling fresh PB in the cold case the final evolution here?

With a name like Smuckers it would have to be good.

@AlbertaLark:

Can't use a pencil inside the shuttle because of the possibility of lead or graphite particles shorting something out.

"but sometimes eject their goodness too fast/before I'm calibrated/locked on target"

funny stuff man...

The problem with conventional single lid jars is that they work on a FILO (First In Last Out) basis.

I had thought back in January, when dog sitting for my parents, what a good idea a double-ended jar would be. You see, they save table scraps in a jar to add to the dog food, since it's a dog they don't clean out the dish too often, so it gets pretty ripe after a while. That issue would be fixed by a FIFO (First In First Out) jar like this.

I see no point in this for liquids.

Cheeeee... did those guys never notice the invention of the long-handled rubber spatula?

@infmom: They have a two-headed one just for these jars.

Instead of paying more for two-lidded jars, invest once in a centrifuge and be done with it! Ronan

@Kaiser-Machead: Jalopnik shrimp? Where do you get those? Do they look like cars?

@AlbertaLark: Except the Fisher Space Pen actually has use.
The reason for the pen was that there was concern about pencil dust floating in the capsule, and the fact that, if you break a pencil, you now have a 2mm piece of metal floating around, readily awaiting to short circuit something, and inevitably costing NASA at least a few thousand.
That, and the Fisher company spent $12 million of their OWN money for development, not NASA's.

Carry on...

@nutbastard: Ah. One sentence.
You are a ninja of words, my friend.

@nutbastard: True, that is bad, but nowhere near as bad if those ants get loose. Homer, NO!

@Curves: er... how? you turn it upside down to open the other lid, you still need a long spoon. why not just hold the jar sideways from a normal lid? Or turn it upside down to empty it - still don't need a lid

Seems a bit pointless to me too. Perhaps cleaning is an issue? If people really have issues cleaning the inside of jar get a dishwasher, a jar like this is the least of their worries. If it ain't broke...

Would never pass in the real world. The contained product would be resting on a non-sealed surface (the bottom lid as opposed to the impervious bottom of the jar)). This would invariably lead to broken seals and therefore spoiled product. Nice try though.

It's a good idea, but it's just going to be more hassle.