Cheap-ish portable practice rig that doesn't require a computer?

[donaldr]

Here's another solution: https://www.boss.info/global/products/gigcaster_5/

 

[treyhaislip]

Bass PODs is what I would recommend.

 

[ehdwuld]

Positive Grid GO

uses you phone to set up four presets

Mine has one clean guitar
one distorted guitar
one bass preset
one super clean flat for acoustic or feeding another modeler into