If you're looking for the most compact blade on the planet, you've found it. The Utility Knife 2.0 uses an ingenious lever system and neodymium magnet in tandem with standard utility blades to give you four controlled depths of cutting. In addition to slicing your fishing line or opening packages, it also doubles as a bottle opener – and easily attaches to key rings and carabiner clips. Need to travel? Just take out the blade and it becomes TSA-friendly.