IIRC, the M-113 holds 11 mounted infantry, the Bradley 9. Bradley has a crew of 3, versus 2 (?) for the M-113.
WRT another post about crew losses in VN -- didn't those M-113s have the big internal fuel tanks and no spall liners?
Oooops -- bad math. 6 soldiers in the rear, and squeeze one more in behind the driver = 7, not 9. Plus three crew. 10 total in the Bradley.