Some of us carry miles of charge cables. Hitch a hair tie to each of your cables and leave it there. When it's time to wrap it up, it's right there, ready and waiting.
Step 2: Cable management Pt. 2: Hair tie + Paper Clip
Hitch a hair tie to the long edge of a paper clip (a keyring could work for this, too). This simple contraption can snap on, and off a handful of cords faster and easier than velcro ties, or string. The paper clip locks the hair tie in place.
Step 3: Instant changeroom hook: Hair tie + Carabiner
I get changed for my bicycle commute in this storage room. This makeshift "hook" helps me keep my stuff off the floor. (The carabiner would be a fine hook on its' own, but the hair tie makes it more versatile, for weird spots like this)
Step 4: Third hand: Hair tie + Binder Clip
The mighty binder clip can do even more when it's paired with a hair tie. Here it is, holding a cookbook, and also locking my bike basket in place.
Step 5: A place to hang your hat: Hair tie + Binder Clip
The gym (or the park, or the beach) doesn't always have a place for a hat. Rather than smashing my hat into my bag, I clip it to the side. Pictured: a binder clip, lashed to my backpack's grab handle, with a hair tie.
Step 6: Purse caddy: Hair tie + whatever
A hair tie on a purse strap is a quiet, unobtrusive way to keep commonly used things (like housekeys,) close at hand.
Step 7: BONUS! Hair tie!
...or you could use it as a hair tie. But that would just be silly.