Looks like rope, works like string
But there are work-arounds for that and I was surprised at the variety of suggestions and methods below the "Read More" on Glenn's post (for those who can't read them at BoingBoing). Seems like another Army of Davids to me.
Also seems like the rope Glenn mentions was just a picture on the outdside of the box. Inside the box was an old child safety cap. Here's hoping it was expensive stuff.