That’s a thrilling concept! I’d add a few mechanical flourishes to turn it from sleek to astonishing: first, magnetic “telescope” extensions that lock the suitcase into a compact daypack shape, then retractable wheels that fold under the straps for easy street‑style. Add a micro‑gear biometric lock that engages on a simple hand‑print, and let the solar panels be a modular panel‑sail that flips out like a kite when you’re parked. A built‑in power bank hidden in a detachable zip‑bag lets you charge your phone on the go, while a tiny, quiet hydraulic pump could raise a hidden rain cover with a single button. Finish it with a lightweight, rotating “spinner” frame that lets the bag roll or swing depending on your mood. All parts fit into the same chassis, keeping the whole unit balanced and as precise as a pocket watch.