Someone has said something that now makes me wonder if I've been stupid and lucky over the years... when I get up to go to the toilet during flights, it has never occurred to me to bring my stuff with me. My last few flights, I've brought a max-size wheeled carry-on which goes in the overhead bin, and my camera bag (similar to
this one) as my "personal item" goes under the seat in front of me. The wheeled bag contains my laptop, camera lens(es) not on my camera, other valuables, changes of clothes for two days, travel-size toiletries, the stupidly expensive bottles of Mountain Dew I stocked up on in the airport shops because I won't have it again for a very long time, etc. The camera bag has my camera with a versatile lens on, wallet, identity documents, boarding passes, phone, headphones, snacks, hairbrush/comb, lip balm, etc.... all the things I might want to have during the flight, or to access easily when on the ground. And I generally leave the camera bag (and all its contents) under the seat when I get up to go to the toilet. You guys take your stuff with you when you leave your seat during the flight? You wear cross-body purses?
I mean, obviously, I would take everything with me into the toilets in the airport. But it never occurred to me that anybody would try to mess with my stuff while we were in the plane.