I guess i would have to feel it in the flesh. I thought it weight close to 500gr, maybe i am wrong! This is an issue for me for example for photography as even if I have a "small" Sony camera (I have the A1), as soone as I put a heavy prime of it (like a 50mm f1.2, or a 85mm f1.4) i need to back belt to make sure i dont "fatigue" my back