your boy looks nice but please don't place packs directly without any padding on his back. You wouldn't do this with a horse, either, and they have much more muscle left and right of the spine to protect it than goats. This pack, even light, is directly rubbing on his spine. Inflammation and soreness can result from that.
The load should also rest more towards the withers/shoulders (without restricting shoulder movement) than shown in your foto. Place the load like a good fitting saddle on a horse.
The load should also rest more towards the withers/shoulders (without restricting shoulder movement) than shown in your foto. Place the load like a good fitting saddle on a horse.