I used the bag about 4 times to carry my rather light Yamaha P-95 keyboard to band practice (only 26 pounds). The bag tore out the seems under where the shoulder straps connect to the bag. I can see where they absolutely should not have put the ability to connect shoulder straps with such low quality seem connection. So... you CANNOT use the bag with shoulder straps. I now have a bag with 2 wide open seems to the insides of the bag - not good.