To preserver a laptop power cord, and for that matter to stop the rabbits being electrocuted, I made a rabbit-proof extension cord.
In Canada flexible armoured conduit is required for wiring up lights etc. in an air plenum, so it is readily available.
It is only single-strand cable, but the covering keeps the bending radius large so it's not a serious issue. I fitted a regular 110V cord-end plug and socket, and clip the socket end to a tabletop so that the unprotected cord does not fall to the floor.