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If your experimenting with making your own backpack...and adding
backstays, bendable aluminium in flat or round section is available from
your local Bunnings. In short 1m lengths or longer. ;)

If your having a go at making your own backpack, Clark Rubber also have
Hi Density foam for shoulder & hips belts.....

Thanks for tracking down & sharing all these local Aussie hammock accessory vendors, simon.
If I ever have mystery that needs solving, I'll be sure to give you a call ! ;)

I'm just as bad...I...

Try good ol' Bunnings again......tie down straps section, just cut off the heavy cam buckle, unless you wish to experiment with it. 1inch/ 25mm wide. They come in different lengths, 1,2, 4 & 6m...