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I read that a reviit (the minimal size for a cup used for kiddush, havdala etc) is 86.4 mL according to the generally accepted view (see here for options). Does anyone know where I can get a cup that is exactly that size or as close to it as possible? I don't need to be using extra wine when I make kiddush every week.

Double AA
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2 Answers2

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This cup is 3 oz which is 88.7 ml and is actually a kiddush cup :)

avi
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    To be clear, your cup is 3 ounces. I don't know enough laws about advertising but I bet they can be slightly off and still label it that way. My answer above is a European manufacturer who labeled it as 94 mL. But, yes, yours is an actual kiddush cup! – Double AA Dec 06 '11 at 18:55
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    Compare with this cup: http://www.amazon.com/Woodbury-Pewter-Communion-Cup-oz/dp/B001A6LR82/ref=sr_1_11?s=home-garden&ie=UTF8&qid=1323197647&sr=1-11 They are clearly the same cup but one is $10 cheaper! I wonder if it counts as AZ.. – Double AA Dec 06 '11 at 18:55
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    I guess the Jewish star makes demand lower so they have to charge more :) – avi Dec 06 '11 at 19:11
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    avi, that's the opposite of how supply and demand are supposed to work. More likely, it's for the extra work and additional supply chain steps required to put the star on. – Isaac Moses Dec 06 '11 at 19:16
  • @IsaacMoses That is actually how supply and demand work in Judaica, however. – Seth J Dec 06 '11 at 20:13
  • @IsaacMoses Whenever you have a niche population which has a higher demand for an item than the general population, the item catering to the niche population will cost more than the identical item geared towards the general population. – avi Dec 07 '11 at 07:30
  • @avi Exactly; higher demand. – Isaac Moses Dec 07 '11 at 14:44
  • @DoubleAA Interestingly there is an extremely important (IMHO) responsum of R. Qafih (dealing with temporal quantities) where he says that small differences to not make a difference. – mevaqesh Aug 02 '16 at 00:48
  • @mevaqesh The Mishna implies the margin of error is at most 0.065% – Double AA Aug 02 '16 at 01:07
  • @DoubleAA That Mishna actually implies no such thing. All it implies is that when the law has a specific measurement, then that measurement is a fixed border and can't be passed. But there is no law for the number of ml or oz. – avi Aug 02 '16 at 08:29
  • @avi The Mishna didn't use ml or oz because those weren't invented yet, but as you say the border is fixed and approximations aren't good enough, which is what I said. – Double AA Aug 02 '16 at 12:01
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Try this one. It's 94 mL which is as close as I'd feel comfortable with. The manufacturer's website is here, but the first link has free shipping in the USA.

Lechayim!

Double AA
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    are you talking to yourself?? – avi Dec 06 '11 at 18:50
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    @avi You caught me! See http://meta.judaism.stackexchange.com/questions/306/if-i-know-the-answer-to-a-question – Double AA Dec 06 '11 at 18:57
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    Answering your own question is different from talking to yourself :) "try this one." is something you say to other people :)P – avi Dec 06 '11 at 19:13
  • Hhmm. Are you sure that's an accurate size? I've encountered many of these types of cups that are larger than they advertise. Also, I wonder if Ramma would call it a gluk glass being that the mouth is small. – user6591 Dec 08 '16 at 15:23
  • @user6591 I have measured it with a TD volumetric pipette. It may even be a bit bigger than advertised. As for narrow, it's transparent so you can still see the wine, so that shouldn't be a problem. Plus narrow allows for less volume loss at the top, if you're ensuring you don't spill. – Double AA Dec 08 '16 at 15:32
  • Yeah. They're usually bigger. Sometimes by a lot. Is it your chiddush that clear helps, or you saw that somewhere? – user6591 Dec 08 '16 at 15:34
  • @user6591 Honestly, I don't remember. In any event, [nearly?] all Acharonim are Meikil if there's some Tzorekh, so we're not talking about a major concern. – Double AA Dec 08 '16 at 15:37
  • True. And since everyone has their own cup it may be less of a concern too. – user6591 Dec 08 '16 at 15:40
  • They're also good quality. Mine lasted me from Nov '11 till an hour ago. יהי זכרו ברוך – Double AA Jun 05 '20 at 19:50