Someone is giving me a really nice new pack however it is too large for me at this time I cannot spend more $ on another pack I already purchased one that fits but is uncomfortable as hell when packed with 25lb so much for lite gear. I am considering altering the shoulder straps Has anyone done this sucessfully done this I would like some pointers. I have a heavy duty sewing machine just would not want to cut up a new $200 bag and make it worthless.