So far all the glass bottles have arrived dry and that's all I am looking for when I pick up liquids. I store everything in a cabinet and they sit upright. When I use a bottle it gets transferred to plastic for ease of use.
When I ordered from other suppliers that had glass I did have leakers during transport. I also believe it's the nature of the beast. I went to hobby lobby and picked up some 240ml squeeze bottles for liquid transfers. Slice of the tip to the correct size and they work great. Just don't jam the tip all the way into the new bottle or you create to much pressure for the liquid to transfer and make a mess. And I'm speaking from experience
Just search Squeeze Bottles on their site, they have droppers there too for $3.99 for a pk of 4
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You are a super super nice guy, and I have been lucky to do a few juice trades with you. You are a hero for them with the way you seal and package them and even add zotz. I highly recommend people get that experience if someone gets a chance to trade with you. That being said I have a nicoticket 500ml bottle with the a cap similar to the hobby lobby bottle. It does o.k., but I will take my mini funnel any day over that. I even tried just using the cap from one as a funnel and wasn't thrilled with the results. I had to pour slowly through it due to flow issues. I tried trimming the tip to adjust the flow as well. I think I would lose a lot of juice out of a 60ml if I tried to transfer with a 240ml bottle like that just with the residual left in the bottle. Others may have a different experience. For me there were air flow issues with trying to get the liquid in the bottles quickly. I use the smallest funnel from this set with great luck.
Stainless Steel Mini Funnels, Set of 3 | Sur La Table
Anyway I don't want to sound oppositional or that your method may not work well for others, but thought I would share what my experience was.