How to secure it without straps

I just received it. The delivery time was a bit long, but as promised. However, how are we supposed to attach this bag if the straps aren't provided?! First time I've ever seen that!

Question

How do I attach it to the bag? Do I need to glue or sew it?

Notice

The instructions are not in French.

Perfect

Fast delivery, slightly different from the photo; the outer hoops are semi-circular rather than the rounded rectangular ones shown. Actually, it looks nicer, so I'm very satisfied. Quick assembly, I recommend it.

Perfect

Ordered in black, fits perfectly on my matte black 2011 Storm with a comfortable two-seater seat. Follow the assembly instructions carefully (even though they're in Spanish). It's a shame the screws are different from the original, but they fit without any problems and are discreet. Excellent advice and customer service!