I've got a load of gear too, and I'd never have got one myself but it's very cool and fits in my guitar case so I can play amplified anywhere. If he has the money to get whatever he wants, you need to go left-field and think of something he doesn't know he wants... ;)
The roadie wrench is also a great idea... saves looking for allen keys and screwdrivers... all the tools are there when you need them. I agree with Superhuman... he's just going to love that you got him something guitar-related...
Check out my music, video, lessons & backing tracks here![br]https://www.renhimself.com