THIS
I currently use Vision V-18 tubs for my hatchlings (18" x 7.5" x 3.5"), Iris MCB-L tubs for my grow-ups and adult males (32 qt - 16.5" x 24.25" x 6.25"), and Vision V-70 tubs for my adult females (41 qt - 34" x 17.5" x 5.25"). These are very standard sizes of tubs when it comes to BPs.
For a 928 gram BP in my collection, I wouldn't even be considering moving up from a 32 qt to a 41 qt tub until they gained another 300+ grams (if it were a male, it'd be staying permanently in the 32 qt). Even then, I'd be very conscious of any feeding issues associated with moving to a larger enclosure. Many times they are comforted by being in a smaller space and will eat much more reliably there.