Sorry if this is lame, but I'm a newbie and constantly on the lookout for things that make mixing easier.

My juices are always 20/80, the PG is just there to offset the flavourings (max 20%) so the entire juice is always the same PG/VG content. Instead of measuring nicotine and VG out in various sizes of bottles, I just made a batch of vg nicotine, that will yield me (when flavour and PG is added) a juice that's exactly 20/80 3mg juice!

Here's how I did it: Fire up your ejuice calculator, fill out your desired PG/VG ratio (end product), enter the total volume of juices you'll be making (so 2x30ml 6x10ml = 120ml), make sure you have a sealable container large enough for the total amount, fill the container with the amounts of VG and Nicotine that you have, DO NOT ADD THE PG. Shake. Done!

Things to be aware of: Are any of your flavourings VG or alcohol based? Will your nicotines PG content let you have room for the amount of flavour you're going to put in the juice? My nic is 100% VG so that's simple.

Now you're over with the potentially dangerous part of mixing your juice and you can save time and effort by not filling lots of individual bottles with small amounts of liquid. Yay!

If there's any error in my reasoning or if you have some more nice tips, please share.