Folding stock chassis options

Does it need to be folding or is telescoping also an option? JTAC makes a chassis with both possibilities, in a short action Remington footprint. If I wanted a super compact backpack gun, I'd start there.

Edited to mention that this is not exactly inexpensive, but folding options typically are not. Solid lockup makes a big difference, and doesn't come cheap, really.
 
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Tikka T3X Tac A1 is about as inexpensive as a quality chassis rifle gets. Not particularly lightweight, though.

For lightweight folding chassis rifles, maybe SIG Cross or a build on the Porksword chassis.