I found this 2 yr old thread here, and instead of bumping it will just reference it here.

https://www.dmt-nexus.me...mp;m=1052317#post1052317

1) I just want to make sure this flask is fine. I would not use the included rubber stopper though.

Hailstorm in the above thread says that using a magnetic stirrer (which I have) and NO STOPPER is the best way to go. So from that, I can surmise that you would not want a cap on at anytime during the extraction process as you would be stirring and not shaking the contents of the jar.

2) OR, I could opt for this brewery stopper that has a large hole in it, allowing the solution to vent minimally.

These are the final questions I have before introducing the rough draft of my TEK and starting my first extraction, which I am not rushing in anyway. Thank you.

After further research I've learned that the flask is just fine for 50mg of MHRB, but a 2000ml will most likely be necessary when moving to 100-200g.

I have also learned that a cap is not necessary considering I will not be at any point turning the flask up and over to mix the solution as I will be using a hot plate and magnetic stirrer.

Mods you can delete post, or you can leave for others to search if they have a similar question when first starting their shopping lists. Thank you and I will try to be a little more patient and search the forums more. Shout out to f1 and Cosmic Lion for some helpful information in the chat.

There was a PTFE screw on cap for 1000ml flask I saw on Amazon but the problem is that you don't want a tight seal unless you are just doing a quick shake.

Cork I have no idea if it is safe or not but you may run the disk of it dropping into the flask if it deteriorates. Hopefully someone here can answer that question. I did read that a glass stopper is the way to go but you need to use a cooking oil like vegetable oil to coat the glass stopper so that it doesn't fuse with the flask. This is why I bought a magnetic stirrer hot plate. Such a pain! I have seen people use wash cloths to hold on the top of the flask as well but that just sounds messy to me.