"@Weezard: Which size gelatin capsules are those in the post pictures last July?

If you store your rso in syringes and have no "cap" for it, what are you using instead?"

Those were #2 caps.
I needed a little bigger so am now using #1
Next biggest size is single aught #0.

The bigger ones are a good idea, because you don't have to fill them all the way.
That makes capping much easier and much less messy.

If your oils is made right, the small syringes don't need a cap at room temperature.
I stuff a round toothpick in it though, just in case of plunger pressure and temperature changes.

Aloha,
Weeze