Warren, thanks I'll try that as well see what's comfortble for me.
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I was thinking about getting a 19 earlier and after reading alot here on SB, decided on a 30. I went to the LDS, talked with the tech there and he let me try his 40, (they didn't have any 30's in stock). He assured me he could blindfold me and I wouldn't be able to tell the difference between the 30 or 40. Well, I didn't try it blindfolded, but I couldn't believe how unobtrusive it was. I went ahead and got the 40, slung it, and I can barely tell it's there. Now I have a pony that has a GOOD amount of emergency air, and it is a great start for a stage bottle in the future.I would sling it too (across the parking lot ). The only thing a 19 is good for is a rebreather (to big for argon). Sell it and get at least a 30, or preferably a 40.
In spite of all the dimensions in that link being clearly indicated you still don't know what the measurements are?