Corbin recently announced a new rear trunk option for the Spyder. While much larger than the glove box, the upcoming Givi-like storage compartment promises to cost significantly more. For roughly $300, you can affix this easy on the eyes alternative to your Corbin backrest.

I've found it convenient for storing my Zumo, gloves, and sunglasses without having to fish through the trunk.

Summary
If you're looking for quick, secure, and easily-accessible storage, the Corbin Glove Box is an effective- albeit expensive solution.