The RZ3 Safety Utility Knife from Safecutters should be in every toolbox! I love the QuickBlade wheel that allows for an easy blade change with no tools - this comes in handy so often, whether it be building models or unpacking boxes from a move. This ultility knife also has a spring back blade that makes it safer than the standard utility knife. The sturdy construction is also a plus! (via Safecutters, Inc.)