When I was younger, I had a keychain-style pen that I carried with me basically everywhere I went. (Well, really anywhere I took my car keys, which was pretty much anywhere.) The pen stayed with me until it got lost, and I’ve always regretted not being able to find anything comparable. Craighill’s ultra-portable “Caro” ballpoint is the closest that I’ve found.

Available in four different finishes: Vapor Black, Black + Brass, Brass, and Stainless Steel.

• Friction-fit cap uses a garter spring press closure for secure fit

• Refillable, takes Schmidt 635 ink cartridge (or any D1 ink cartridge)

• Dimensions: 3.5" x 0.4"

• Weight: 1.2 oz