Tiny amps for backup purposes

[DBerriff]

I will second the Markbass Nano 300 suggestion. Simple but with effective tone controls. Small and light enough to fit in a gig bag. Speakon out and the usual DI settings. I cannot comment on the max power output but it drives a Genzler 10” cab with plenty of headroom against a big band.

[bonzodog]

+1 for the elf.

I bought it as a backup to my MB500 but now use it more as main head as I like the tone. It's capable of doing noisy mid sized pub gigs with my 2 x 112 rumble cabs with no PA support.

The lack of speakon is a pain but the size is incredible. I have hard cases for my basses and it fits into the compartment where you normally put a strap so i don't even notice it's there.

[naxos10]

I use a Markbass Blackline 250 as a backup. Nice little amp which would suit the three styles (originals, covers....) you mentioned earlier regarding styles plus it's lightweight.

[Adee]

I carry a TC RH750 as well as a TC Classic 450 as spare ... never used it but you never know!

or ...

Peavey MINIMAX ? another ickle amp putting out some seroius Oooomffff for around £250 new

https://peavey.com/products/index.cfm/item/659/118756