If you are just wanting more headspace for 1 gallon batches, then these 5 liter swing tops worked well for me for quite a few batches. I've now moved on to a small 3 gallon conical though.
https://www.everythingkitchens.com/...ogle&utm_medium=cse&utm_term=149270M02321877#
The side walls are thin, but I've successfully drilled the tops for blow off tubes or stoppers and airlocks as well as put spigots in the bottom of them after making stands for them to sit on with these hole saws....
https://www.amazon.com/gp/product/B0778NND9D/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
I did this with a drill press that I can slow down to less than 60 rpm and kept water flowing on the hole saw constantly as it cut. Bottom is quite thick, it took about 30 minutes or so it seemed.
Though I wouldn't recommend these to anyone that doesn't take their safety to ridiculous levels when modifying them or even just using them in general as when glass breaks it'll be when you least expect it and it's so sharp you won't feel it until you realize there is blood all over the place.