Ok, if this is an old concept I'm sorry for a repeat. I have read many times on here to always stock up and be prepared for anything. Things like accidentally breaking vials, possible vial contamination, stolen gear, lost gear, etc. Now if you were like me on your very first cycle you were thinking, "damn how do I know this source is legit, what if I'm pissing my money away here, I had better just order what I need for this one cycle." So, I calculated exactly how much gear I was going to need for a 12 week run of Test Enth. Here was my calculation, 12 weeks @ 2 injections of 1ml every week means I'm going to need 24ml of Test Enth. Luckily for me I couldn't put in an order for 24ml of Test Enth, because I would not have made it through my cycle. Now, the majority of gear you are going to get will come in a 10ml vial. I had to order 30ml, 3x10ml vials, of Test Enth. The reason I say I'm lucky I couldn't order 24ml is because I would have ran out before the 12 weeks were up. When I was planning my first cycle I didn't realize that when you pull 1ml in the syringe there is actually a little extra that is in the pin and tit on the syringe. Your 1ml is more like 1.09ml(this is an uneducated guess), and on top of that when you get to the end of the vial there is a small amount of oil you just can't seem to pull out of the vial. Ok, so if you have made it this far in my long winded boring essay this is my suggestion. When you see 10ml vial calculate it as a 9ml vial when figuring how much you need for your cycle. Figuring it this way will give you enough room for that small amount left in the syringe and that little bit left in the vial. Hopefully this will help some one, but this is how I figure up my cycle needs. Also I now stock up on gear, so I usually have extras just in case of an unfortunate accident.

TLDR:
Damn you're lazy, but always calculate your 10ml vial as if it was only 9ml. If you want to know why you should read above.