I love these things. I use them on all my electronics cables (both my laptop, and my home PC).
These cable wraps have a slot in one and and you pass the end thru the slot to attach the wrap to the cable so the thing doesn't get lost. Then bundle the cable and wrap the velcro around it to secure it.

They're great!

These are very similar to what the guy in our IT dept gets. Except, he buys them on a roll, and gives them out as people ask for them. He just unrolls as many as you need and tears them off at the precut perforations - very cool - if you need them in bulk - like he does.