The rules change this year to allow 45lb of the robot to be withheld has some teams thinking about keeping most of the robot out of the bag.
Is your team thinking about this? There are a couple rules you should read and consider:
First, read rule R1, which defines ROBOT.
http://frc-manual.usfirst.org/viewItem/3#4
Then read rule R18, which specified what and how much can be withheld from the bag:
http://frc-manual.usfirst.org/viewItem/8#5.3
Then read the rules on Bag and Tag:
http://frc-manual.usfirst.org/viewItem/8#5.3
Now think about this. You are at the entrance to your event, talking to a robot inspector about what is in the bag and what is in your 45lb box. Can you justify it against the rules above? In particular, can you argue that what's in the bag meets the intent of R1?