Most noticible thing ive seen is the newer packs(EAM 6000) DONT swell... we usually buy new packs for every major race we attend but this year i still have great packs from aug of 17 no puffing and only about a 10% differencer in IR/run time
Now EA has his new 8000 pack with even better IR and is much lighter than the other 8000 packs (322g)