Cassp, the double manual SK2 is 35 ¼ lb...a bit heavier than a Tyros4 (33 lbs).

Depending on the type of case, it might still be manageable?

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.