Any patch can be made iron on. You can buy a sheet of iron on material. There is also special double sided tape for patches. But the best way to add a patch is with hot glue.
I've got a couple of them now, but you know, I never checked if they were iron-on or not... The easiest way to tell is just to set the patch where you'd like it to be and run an iron over it. If the shiny backing is an adhesive, then it'll set onto your backpack without problems. If its not, then there shouldn't be any harm to it, and you'll just have to sew (or glue) it on.
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Time to break out the needle and thread...
Let me know what happens... I'm curious. :)