First of all, these are a great concept!  To have something to keep sippy cups and toys from falling to the floor in a restaurant or outside is great, but this one is not a good choice.  There are better ones!  I have only used this strap a hand full of times.  On the first attempt, the button was so difficult to punch through the hole that it took more time than it was worth.  Then there was the removal...which took even longer.  I do like that the strap has a removable piece, where you can attach it to let's say a high chair and remove it with one touch of a clasp.  After using this product for approximately the fift time, I went to put the button through the hole, and it came off.  I tried to re-attach it, but it required glue...too much trouble, so it got tossed.  This is a good product in theory, but too much to it.  There are simpler products similar out there.