Yer Military bend is showing. For those not on the know: 100mph tape is military grade Duct Tape. It was called that because they used to use it to repair damage to aircraft (back in the prop days) & was rated to hold up to ... you guessed it ... 100mph.
I'll let Marlin tell the story on 550 cord (also good to have in your trail kit).
"Used to?" Last I heard they were still "repairing" wing and tail cracks with duct tape on our **** planes in the Middle East.