Those tubs are roughly 30" by 20", if I remember right from building my rack. Around 6" tall.
You can fit 1.3 rats, though for my purposes I don't leave the male in all the time so it may need slightly more frequent cleaning once you have babies growing. I usually have 2-3 females with babies or 2-3 females plus the male while being bred
Aim for tubs with no edges or creases inside. This limits their ability to chew on it since they can only access the flat surfaces. If they are prone to chewing (some lines have had this trait of chewing the tub bred out, some have not), they can easily make a hole big enough to squeeze out of in a few hours if they can get their teeth around a starting point like a lip or edge of the plastic.
The sisters thing is largely myth, in my opinion. Well bred rats should be able to be placed together at any age from any litter and be fine. If they are not, it is a sign of poor temperament and many breeders work to cull that out.
Your females will probably be pregnant all at once within a few days depending on their cycles. Female rats are "ready" roughly every 5 days after they are old enough to breed. Most of mine are same-day or 5 days later when bred at the same time.
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