After receiving the case, I realized that it is far too large for the Roland Jupiter-XM. For reference:
Jupiter-XM dimensions: 576 mm (L) × 308 mm (W) × 93 mm (H)
Thon case internal dimensions: 630 mm (L) × 445 mm (W) × 160 mm (H)
While the instrument fits, the case is much larger than necessary, making it bulky, heavy, and impractical for transport and storage. Honestly, I find it disappointing that the case was not designed more appropriately for this specific instrument. It feels like the design did not consider the actual size and practical use of the Jupiter-XM.