I've never had a problem taking bigger bags, that aren't at capacity, so they still fit when squashed or just making them look smaller by tightening compression straps etc....
I did exactly that recently. Got my Helmet, harness, rock shoes, big I pad plus a few other bits in my old 40litre montane pack. I did take out stiff back bit in rucksack, compressed it fitted perfectly under seat.
Same here. I just use my Vaude Croz 48 (great rucksack, sadly no longer made) with the lid and hipbelt off and straps pulled tight. Never had a problem flying with it.
I find rucksacks that are specifically designed to meet cabin luggage limits, like the DMM Flight 45, just that little bit too small to use as a general purpose cragging bag. (And no ice axe loops)
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