One Small Slip Joint for Five States: A Traveler Asks r/knives About Carrying a Sub-2.5-Inch Folder Across CA, AZ, NM and CO
Knife law in the United States is a patchwork, and traveling with a knife across state lines means navigating it state by state. A r/knives member posted the question on September 9 with a disclaimer that earned instant respect: I'm a bit autistic (in the real way, not the Reddit way), and I love pocket knives. His plan was a road trip through California, Arizona, New Mexico and Colorado, and his goal was one knife he could carry in most places. After heavy, autistic research, he had landed on a small slip joint under 2.5 inches — and he wanted the community's read on whether his legal map was accurate.
His research was, by his own account, thorough. California: a slip joint under 2.5 inches should be legal almost anywhere that isn't a prohibited place. Colorado: more than fine. Arizona: doesn't care at all. New Mexico: looks like leave it in my personal car. The humility in the post was the point — he had done the work, but knife law is notorious for details that change everything, from city preemptions to prohibited locations like courthouses and airports. Asking before traveling is exactly the right move.
The comment section confirmed, refined and expanded his research. One member validated the small-slip-joint instinct with a suggestion: one of those small Swiss Army knives would be great — very non-threatening to knifeless folks. Another offered the big-picture correction that surprises many travelers: Washington state is actually the most restrictive in terms of blanket bans, while California isn't actually bad if it's not an auto, gravity or butterfly knife. The thread's most useful comment was a resource drop: kniferights.org maintains a state-by-state legal blade reference, the kind of link that saves travelers from trusting a single forum thread with their legal situation.
For anyone planning a multi-state trip with a knife, the takeaways from this thread apply well beyond the four states in the title. Size matters — sub-2.5-inch non-locking knives are the safest possible category in most jurisdictions. Simple mechanisms matter — slip joints and SAKs avoid the auto/gravity/butterfly categories that trigger restrictions. And verification matters most: use a current reference like KnifeRights, check the specific cities on your route, and remember that prohibited places (courthouses, federal buildings, airports) override otherwise permissive state law. A small SAK-style slip joint is the rare knife that makes the whole country feel like one place.