I have a Dragonfly J107 with a bunch of accessories and the big expansion bag. I think it's 130 litres with the Spike Duffel and 80 without it when it's fully expanded. I either don't take the duffel or I have it rolled up really small (about fist sized) and stashed.
Only downside to me is the weight - I think the bag alone is about 3kg's. But it is tough as hell and you'd compromise on weight or features by making it any lighter.
The design is great really. I can put 2-3 days worth of stuff in it and barely even use the main pouch. Nearly everything fits in the long round external pouches (perfectly designed for tents, sleeping mats, etc). I just put my sleeping bag and food in the main pouch and compression strap the fuck out of it - probably use 20% of available room.
You do need to be pretty strategic with how you pack in terms of the weight distribution when using the scabbard, like you mentioned. You can play around with that and suss it though. I now pack the round external pouch on the opposite side of the scabbard a bit heavier. Not by much, but it helps to even the weight out since your rifle is slightly on the other side. Can't say the weight difference has ever been a problem, but may as well try and even it out.
The idea is you go in with a small(ish) pack, everything compression strapped down. Set up camp then you've got a very small pack and off you go. Kill something, expand the pack right out or even add the expansion duffel if needed. Throw everything in and you're golden.
Has loads of handy pouches, the zips are sturdy as hell and can be used to twist together to keep them closed how you want. Have had it out on a few trips and carried 40-50kg's in it with no worries at all.
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