The little rig I bring with me when I travel (For pleasure not music related) is a little Marshal full stack (You know that real small 8 inch or so practice amp Marshal makes as a practice amp) with a Rockman Duct taped to it and sounds great from when I'm not around my monster rig (wich I just upgraded with a Compressor/gate/limiter(Rackmount), and a BBE Sonic Maximizer(Also a rackmount)).

Best of all..it clips to my belt (The marshal thingy)