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Fed up with leaky tyres so need tubes for tonight.
No 29s but lots of 27.5..
Instant death?
Will fork for an amount of time unless it's a really bulky one
I've used 26" before to get me home without issue. It just stretches a little more.
No, it'll be fine. Have you played the innertube-pump-until-it-blows game? 26ers end up like tractor tyres before they let go.
Always carry a presta-valved 27.5 tube with me as a spare, can be used for 26/27.5/29 wheels with presta/schrader size valve holes so covers all bases.
No problem at all.
As with Facian, I carry a spare tube in presta-valved 27.5 flavor for all eventualities.
I even temporarily ran one in a 29+ setup without issues.
Managed to put a cheapo wrong sized one once on my 29er.
Never  really realised what people meant by ears ringing (was only in the passage with it an not near it) until  the tube went bang.
Run wrong sized ones on my fat bike as they weigh crazy less than the proper thing.