I understand getting to that level of 'concern' or possibly 'paranoia' about things going wrong. But, I just can't do it. I never bring a backup bass, I truly believe the chances of my bass going down is pretty slim. I don't bring a backup amp either, but I am prepared to just go direct if need be. Extra cables, strings, batteries? Sure, that doesn't require much and I usually just keep them in my truck at all times. Now, understand I am not playing A list locations, and I am usually no more than 20 minutes from my house, so there is some cushion in case of a complete catastrophe. Over 30 years of playing has made me lazy I do believe.
Same. I used to (nearly) always bring a back-up bass to gigs. Nowadays, I would just bring extra strings (the last set of old strings, which would be already pre-cut to length, saving time and negating the need for wire cutters) and extra batteries. While many on here have never broken a string in their entire playing career, it's happened to me twice (granted that was over 20 years ago). Fortunately, those old strings I stuffed in my case came in handy. I also had a battery go dead right before a gig and having an extra one saved my bacon. Oh, and and extra cord isn't a bad idea...
We used to lug a ton of extra crap with us (carried in a crate). Other than the power strip and extension cord, said stuff was rarely needed. I guess there is something to say for being prepared though.
