Suitcase Fusion Replacement Icon, WIP

Shot23 suitcaseicon

I'm a big fan of Extensis' Suitcase Fusion and I've been using it for a couple of years. Version 4 is a big improvement, but I'm not really diggin' the icon they use, so I decided to give a shot at designing a replacement icon.
It's only my second try in icon design, so I'm learning a lot in the process.

This shot is a work in progress, because I'm not happy with the 'Sf' part yet.

Feedback is well appreciated!

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