This is like carrying around a small toolbox with you everywhere you go. It contains everything from a strong pair of pliers to a saw, knife, and very functional screwdriver.
Price: $90 | More information
I pop one of these in my wallet so I have a basic set of tools with me whenever I don't want to be weighed down by a full-sized multitool.
Price: $38 | More information
After having one too many pen decide it was going to release its schmoo all over my pocket, I switched to carrying one of these around with me. I have broken them a couple of times and the company has always fixed it for me, and I have lost a couple too, but overall this is a quality bit of kit.
Price: $25 | More information
I never leave home without a flashlight. I like this one because it has variable output ranging from a glowworm to a 920 lumens beam that feels like it has a recoil.
Price: $75 | More information
Not sure as to the availability of these in the US, but here in the UK you can get little vials filled with radioactive tritium that can glow for more than 10 years, with no batteries, recharging, or exposure to light required. Really handy for attaching to keyrings and tools you don't want to lose.
Price: $12 | More information
A small, portable battery power pack that can help top up my smartphone to keep it going through the long days.
Price: $12 | More information
No point carrying around a battery pack to recharge a smartphone if you don't have a cable with you. My portable cables of choice are the Nomad Keys. There's one for the Apple Lightning port and a micro USB version for Android and other devices.
Price: $20 | More information