I did the two batwings day pack set up for a few years and worked fine - I think the batwings are about 700c each. They do limit "hard" fixed shape items a little and lend themselves more to stuffables IMO. I did this configuration a ton - two batwings, tripod/scope in between, rifle Slik Sling right side:
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In '24 they came out with the large batwings at about 1000c each and I decided one of those would work vs two smaller ones just fine and went that route, worked great! Usually set up like this with single large batwing, tripod/scope offest left side, rifle Slik sling right side:
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There were times when weather got colder that a single 1000c batwing got a little tight last year so this year I just added a lid, extra 800c, to the system (and new Mod frame). Worked great - I never wanted for space and managed to not fill up the extra space just cuz I had it, which I've been guilty of in past and hauled around a bunch of crap I didn't need. It's kind of hard to see the setup but it's a single large batwing that I just set into the meat cradle then put lid over that - it gives me quik access to the batwing from above to pull out a puffy and just stuff it back in. Day food went in the lid:
Single large batwing and lid - pretty tidy setup IMO:
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Single large batwing and lid is my favorite/preferred of the configurations I've used.