Huh. I drag my 11" M2 Pro all over the place in just the basic Apple case. Not had any issues.
....
As for ThinkPads, lets not go there. My PC laptop, a Dell, likes to empty itself in my bag on the way to the airport. Then it only lasts 3h if you are lucky.
Well, this is a spec from a Lenovo 14" (however it has an alloy bottom but composite top):
Battery
• 3-cell (58Wh), integrated
• Supports Rapid Charge (charge up to 80% in 1hr)
Battery life
WUXGA low power (non-touch), Snapdragon® X1E-78-100, 32GB LPDDR5x, Win 11, 58Wh battery, best power efficiency power mode.
• JEITA-BAT 3.0 (Video/Idle): up to 19.32 hours / 37.37 hours @200nits
• Local video playback: up to 34.9 hours @150nits
Rapid charge is pretty useful at the airport I guess ... who knows on the plane. But the battery life is a lot better than the iPad. But it weighs 1.24 kg. Several others in that ball park for battery life. Most also have a spare m.2 slot for an extra internal drive.
Every Apple device has had huge increases in battery life, except for some reductions in the odd incremental iPhone Pro Max's & Plus's (I think the 13 or something had a bit worse battery life). max's have sometimes had less battery life because they push their CPUs harder.
I don't take today's iPads seriously, because for me, such devices are intended to be self powered. And when charging, done so without cables, thanks. I bought an Ultra watch for one reason - its got a better battery. The battery life of an iPad can't make a long haul flight.