<span class="link_user">@geegee</span>, I used a 2 gallon but I think some mistakes lead to it's height being shorter, i would probably go with 3 gallon.
<span class="link_user">@hansherbert3</span>,just got a honeywell humidifier on amazon for 40 buck and I don't have a ventilation system so I just close the top vent so I don't loose too much and let the side smaller vent simply half open so I still get air circulation but still get to keep most of my humidity. I made some test prior to grow to be able to know what level I should adjust my humidifier to get what level of %, at like half capacity it gave me round 70%-80% ,if I kept it fullblast was giving me 99% and water was perling on the wall lol not recommended do as fo sure will get u fungus gnat ...my next grow I will keep it at 60% max to avoid any issue with fungus gnat ...have some seedling in 30% right now and they do just as fine maybe take a lil longer but dats fine for me
<span class="link_user">@geegee</span>,I have one in a 5 gallon cloth bag and another in a 2.5 gallon bucket..the one in the 5 gallon is bigger..however I planted straight seed into the 5 gallon and transplanted the smaller one after it sprouted so could have been the transplant too