yes, as I understand it, the sting packs without the compression straps (so called ‘generation 1) have the zips from top to bottom, the sting packs with the compression straps (so called generation 2) and the low alpine civilian models of the sting, have zips from bottom to top same as berghaus or the PLCE Bergen’s etc. Could be other variations out there I don’t know about though but I have had gen1, gen2 and civi bags and they follow this pattern.
The actual zip size is the same on all the bags (is on my ones)
Kevin at endicotts told me all this when I brought my Dutch sting yonks ago.
I am honest the zips top down is better, looks neater and you don’t get that irritating half inch of undone zip where gravity drags the slide down a bit