Hard to tell from your question exactly what your intended use is, but for some volume in a very small amp you might try the Markbass Micromark. ~9" cube, 50 watts.
Getting bigger but still small and loud (and less expensive) is the Line6 Lowdown 110.
Phil Jones Bass makes some small stuff but also fairly expensive.
Thanks Tim and Willie. I'm looking for something that will fit in a gig bag or suitcase and be suitable for some spur of the moment jamming with other players in out of the way places. A battery option would be nice but not necessary. I'll check out both the Vox Pathfinder and Markbass Micromark.
Sweetwater also sells the Roland MicroCube, which does have a battery option. I have no experience with it though, so I can't personally recommend it, but it does get good reviews.
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