Some could be used in a pinch, but the Travelsafe is in a league of its own for what it accomplishes, I think. For instance I also have their Exo-mesh bag surround... you can insert a number of items including a small carry-on into it, and lock it up in a manner similar to the Travelsafe. But it's such a P.I.T.A. that I rarely use it. It's like trying to handle a bundle of live snakes. Many of Pacsafe's original products focused on purse-snatching type crimes which is a different market segment. What we need is Interstate-snatching countermeasures.
Fortunately the Travelsafe is not discontinued - just sold out.