Think Tank, which makes some awesome photography bags, also makes these small cable wraps. They’re meant to be used on smaller cords, but can be used on larger power cord bundles as well.
I typically use Velcro reusable cable ties as temporary cable wraps, and they’re easy and convenient to use. But they’re not as quick as I’d like them to be for wrapping and unwrapping frequently used cables.
These Think Tank “Red Whips,” are quicker to use than Velcro wraps. They’re simply constructed with elastic “shock cord” and barrel cord locks.
They’re available on Amazon for ~$10 with free Super Saver (on $25+ orders) and Prime shipping options.
I received the pack I ordered, and they have greater capacity than I expected. The barrel locks aren’t as strong as I would like for heavy duty use, but they’re ideal for lighter duty use as you would expect from a photography accessory.
I am also in the process of ordering parts so that I can build my own cable wraps. At the time of this posting, USA-made ITW cord locks cost around 30 to 60 cents each, and cord is $7 to $12 for 100 feet. It’s more economical to just buy these wraps, but the DIY route allows for greater flexibility if you need a lot more cable ties or longer lengths.
Update April 2022: It seems that Think Tank released a “V2.0″ pack of Red Whips. As far as I can tell, there’s no difference other than packaging. With this new pack, you get (10) regular-length 6″ whips, and (2) longer-length 7.5” whips. The pricing has increased at some suppliers, but as of the time of this update, Amazon still has it for $10.