Bit of a tall order I know but I play bass (electric) regularly with a bunch of trad Irish musicians and occasionally we get to play abroad where most of the fun can be had during down time in local pubs, street busking or jamming in hotel lobbies etc. In those situations mains power is not always available so a small battery powered combo would be very handy and allow me to join in the fun... I actually did try a little Roland Micro Cube 5w combo some time ago and tested it out using battery power at a few unplugged sessions locally but found it woefully under powered especially in a busy loud pub environment or even in quieter rooms when the accordian, fiddles and banjo etc stated to crank up... so I'm looking for something battery powered with a bit more grunt but that is still small and light enough to carry on board an aircraft and sounds reasonably OK... any suggestions welcome 
