Do you know what these are? They look like alien worms don't they? But no, have you heard of George de Mestral?
This purse for instance:
There is a shoulder strap, but I'm more of a hand-bag or messenger bag person.
So Velcro to the rescue:
Now, even when it's stuffed, I can shake it up and down and it still won't flap open. All thanks to M. de Mestral.