Half a croissant, on a plate, with a sign in front of it saying '50c'
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Rucksack lifejacket

Why not?
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A rucksack in which the shoulder straps contain tough, inflatable bladders, capable of keeping the wearer afloat, and with a CO2 cartridge for rapid inflation.

That is all.

8th of 7, Feb 20 2017

Prior art ... http://divewise.org...er-recovery-vest-2/
[normzone, Feb 22 2017]

[link]






       //tough, inflatable bladders, capable of keeping the wearer afloat//   

       Sp.: "...keeping the rucksack afloat"
MaxwellBuchanan, Feb 20 2017
  

       Tougher than you, gay boy.
8th of 7, Feb 20 2017
  

       Earth?? Me too!!
MaxwellBuchanan, Feb 20 2017
  

       // wait, that's not correct, what was it again? //   

       "You can walk a horse to water, but you can't make a silk... er... greener grass skirt" ?   

       No, not that either...
8th of 7, Feb 20 2017
  

       You can take a Borg to water, but you cannot make it think.
MaxwellBuchanan, Feb 20 2017
  

       Too many brothels spoil the chef.
MaxwellBuchanan, Feb 20 2017
  

       You need this feature if you go drinking in my home town; ie tough inflatable bladders.
xenzag, Feb 21 2017
  

       Actually, a last-ditch flotation aid for a real tough guy would just be a small compressed air cylinder and a hypodermic needle. There are several sites on the body where large embolisms are not life-threatening yet can still provide valuable flotation.
MaxwellBuchanan, Feb 21 2017
  

       And if chased by a bear ? Can I run faster than this rucksack ?
popbottle, Feb 22 2017
  

       Shoulder straps alone will allow the rucksack to float off of the body of the semiconscious wearer, who slumps down and disappears into the shadowy depths. Thus implicit in this idea is the strap running down between the legs of the wearer and up the back. Said strap will be kept cinched tight at all times, to be sure.   

       The strap will also ensure that the wearer can walk the walk. A very special walk.
bungston, Feb 22 2017
  

       Don't count your castles in the air before they're hatched, and don't lock the stable door after you lead your gift horse to water
hippo, Feb 22 2017
  

       Hippo, I hope you are properly slurring your speech and gesturing with the mostly empty bottle as you say that. You may bang the table with your free hand for emphasis, or if the two of me decline to overlap.
bungston, Feb 22 2017
  

       Indeed [bungston], most perspicacious of you
hippo, Feb 22 2017
  

       The Halfbakery: 10% exasperation, 90% perspication.
MaxwellBuchanan, Feb 22 2017
  

       <pushes another full bottle across the table to [hippo]>   

       // the strap running down between the legs of the wearer and up the back //   

       No, it comes with an adjustable waist-belt. The other design is only available in a plain brown wrapper to sick, twisted perverts (such as [bungston], who has a credit account, and gets the glossy catalog twice a year for free because of the sheer volume of purchases).   

       // here are several sites on the body where large embolisms are not life-threatening yet can still provide valuable flotation. //   

       No further information is required on that particular topic, thankyou.
8th of 7, Feb 22 2017
  

       I wonder when life jackets came into use. I am certain people have been falling overboard for a long time. Individually each for a very short time, but the phenomenon has existed for a long time.
bungston, Feb 22 2017
  

       I think they originated in the Stone Age, although obviously they've been improved quite a lot since then.
MaxwellBuchanan, Feb 22 2017
  

       Actually, the first ones were made in the Wood Age, before your species discovered stone.
8th of 7, Feb 22 2017
  

       Ah, those were the good old days. Before stone, all we had was dirt, and it was good enough for everybody.   

       Then some damn fool weaponized a rock, and next thing you know there were laws restricting ownership, and you had to carry your rock in plain sight or register it. I made a lot of meat selling rock permits. (link)
normzone, Feb 22 2017
  
      
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