Why not pick up a Pelican case? That is what I use for my regs. Safe, secure and will keep those babies protected.
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This may be an option for those who want to have some protection/organization inside of luggage-
https://www.amazon.com/Evecase-Resistant-Universal-Chromebook-Ultrabook/dp/B00LFJ88SQ/ref=sr_1_21?s=electronics&ie=UTF8&qid=1522012226&sr=1-21&keywords=laptop+sleeve&th=1
A 15" laptop sleeve will hold a reg set, and doesn't take up a lot of extra space. Neoprene, padded, handles, a number of options out there and many are $10.00 - $15.00
Very interesting thread!
As a new dive instructor I need to carry my reg to a pool, to a local dive site, etc.
Most of the time in a big backpack with other stuff - books, notes, iPad, etc.
I was also thinking about ziploc, but I do not see one big enough and it does not provide any protection.
Was carrying the reg currently in a SeaToSummit roll dry bag.
So when it is wet it does not leak on the other gear.
I am curious. Why do you feel you need a reg bag?
Why not pick up a Pelican case? That is what I use for my regs. Safe, secure and will keep those babies protected.