Don: Don't confuse "square" with "sport". Emergency/reserve "square"
parachutes are designed very differently than their main/sport
counterparts. Also, skydivers use a reserve for two reasons: (1)
main/sport parachutes are designed with flight performance as a major
design criteria; they are very reliable but not as reliable as
reserve/emergency chutes. (2) The FAA prohibits intentional parachute
jumps without a reserve. (3) It would be really dumb anyway

2NO