thirsty wrote an answer about The North Face Flex Crew - Short-Sleeve - Men's on May 19, 2009
depends how baggy, but i wrote the below review. i am 6'4 230 w a 47 chest and this shirt fits perfect. not tight, not super baggy, good length. go for it.
the back pocket is roughly, 3.5" wide and 4.5" tall, with good stretch. i say it would probably fit, but too much weight would cause it to sag/stretch a lot.