Quad Box Extension Cord

[brucer]

Sorry if this is a really basic electronics question, but ... I'm interested in building a quad box extension cord to throw in my gig bag.  It seems like every DIY posting out there is followed by dire warnings in posted comments. 

https://youtu.be/QbjcEo7fo0A

http://www.instructables.com/id/DIY-Extension-Cord-With-Built-in-Switch-Safe-Qu/

Are these truly a bad idea safety-wise or can I build one following online instructions.  Any advice appreciated.

[pickdropper]

Well, anytime there is a project that works with wall voltages, there are probably going to be some warnings.

Just curious, what's the advantage of this vs. a power strip with an on/off switch?  The power strip might actually be cheaper and less bulky.

[bsoncini]

As an electrician by trade I can say there is no danger if you properly terminate all the wires. That said I don't see any benefit to this over a power strip with an on off switch. The power strip probably weighs less and probably cheaper too