Good Material For Bottom of Chassis

[Bonzabonz]

What is a good covering for the bottom of the robot chassis to mount things like the control system, battery, compressor, pneumatic manifold, motor controllers, etc.? Last year was my team's rookie year and be used a piece of pegboard (something like this). Probably needless to say, it didn't really hold up too well under the weight of heavier items (mainly the battery) and started to fall apart from the stresses of competition. I was wondering what other teams liked to use and what their experiences with different materials were.