That's because the 3D weapons moulded onto the PVC covers are almost certain to irk security… and probably get you singled out for a rather thorough inspection.
Makers say the weapon-inspired notebooks - created by Taiwan based designer Megawing - are: "Designed to remind us to turn violence into beautiful words and drawings with our creativity."
Personally we were expecting them to go with a dodgy "The pen is mightier than the sword… but what about the notebook" comment. But we're glad they didn't, so we could.