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#1 posted September 20, 2016 at 5:01pm (EST)  
Hi All,

Hope everyone is well?.... I am thinking of buying reusable lunchboxes for my customers, save the environment - You buy the box from me and then you get 5% off your lunch, when you present your box ..... thing is I am trying to find the correct size off Amazon and i can only find Cubic Inches to Fluid Oz conversions.

e.g Ok, so this lunchbox i found is Dimensions: 8.75" x 6" x 1.5" , I put it through an online Volume calculator and it gives me 78.75 FLUID OUNCES, the item description though says is it will hold 28 ounces (I know Fluid ounces is vastly difference from "ounces" except for water - 8 ounces of water is the same as 8 fluid ounces)

so I divide 78.75 by the 28 and get 2.813, so I measured the polystyrene boxes i am using now and get 91.875 fluid ounces and divide by 2.813 = 32.661 ounces - so by my calculation I need a box that will hold about 33oz , my questions are this:

a) Is my methodology correct in calculating the "ounces" that will hold in a box?
b) what does the number (if correct) is 2.813?

I have tried googling this but only get Volume (cubic inches) to Fluid ounce conversions.....

Thanks Dxx
#2 posted September 22, 2016 at 8:35pm (EST)  
I've never used fluid oz as a unit of volume and it's not one I'd normally go to. I'd just stick with cubic inches or cubic cm or something more comprehensible like that. However, I can work in fl oz if you want.

Your 2.813 number looks completely bogus as you're using it to convert from fl oz to fl oz. That's just not right. The conversion obviously ought to be exactly 1.

The box you've described here that's 8.75"x6"x1.5" is 78.75 cubic inches. Ah, that's what you called FLUID OUNCES. The conversion program I have says that's equal to 43.6 fluid ounces. However, you say the description says it only holds 28 fluid ounces. That's quite a difference. Inside vs outside dimensions? Seems too large a difference. Maybe that's the size of soda bottle it'll hold. Except I know a 20 fl.oz. bottle is larger in diameter than 1.5".

So I don't think I've been all that helpful. Sorry.
#3 posted September 22, 2016 at 8:37pm (EST)  
I just looked up the Wikipedia page on fluid ounces and found there are imperial fluid ounces and US fluid ounces. Of course there are. I really would avoid that as a measure of volume if possible.
#4 posted September 23, 2016 at 2:39pm (EST)  
I use this website for conversions:
#5 posted September 26, 2016 at 12:57pm (EST)  
I am wondering if the ounces is a measurement of weight? so a box will hold 28oz ...s= 1 3/4 pounds?
#6 posted September 26, 2016 at 1:47pm (EST)  
I think you are over thinking this. Amazon rules the world, and has lots of disposable lunch boxes pretty cheap! Oh and use this link to purchase: