Edit: Just realized you are asking about long straps for attaching stuff to bag, not short ones for attaching bag to bike. In that case, use these instead:

https://www.amazon.com/dp/B000H60296

Or expand your horizons beyond LBS, the Volles are available up to at least 32".

What i originally wrote: You can get very short Volle straps- the ones with the plastic buckles come in 9" and 12". I had my Carradice bag attached with the 12" ones for a couple years, for easy on/off. i got fed up with them and switched back to the leather ones, which really are just about as fast to undo as the Volles. Maybe you will like them better than i did, worth a try.