[quote name='lemmywinks' timestamp='1398417880' post='2433836']
As already mentioned there are basses which weigh next to nothing. Maybe try a Soloette or the cheaper Aria Sinsonido?
For practice I use a Sinsonido, a Markbass LMII and a 1x10 neo cab (no back problems, just lazy!), a child could carry it in one trip I reckon. Standing and playing with the Sinsonido is a breeze, almost like there is no bass there!
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Another vote for the Sinsonido.
If that's too radical, look at Ibanez GSRM-20. No heavier than an electric guitar, about the same size, and you can get a new one for about £160.