Phip, if the maker wont exchange bags, and shortening strap is not an option, there are plenty of talented folks here that can help you. Depending on your likes and your wallet, it might be easier to sell the bag that doesnt fit and get one that does. Depending again on the style of bag you like, for a VERY reasonably priced bag that is well made you might look at the bags Jim Kerns makes. "No Kings Leather". If they dont appeal to your taste you are on the right site to find one that does. Good luck and remember, its only money!