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I ended up getting a used BigAgnes Fly Creek 2P off ebay.
It's an older model so I can't find its proper footprint for it anyway. If I want to make my own from Tyvek, is there a specific stuff I need or is all Tyvek the same shit?
I see lots of building material Tyvek on ebay and it looks like some people are selling their own tent-specific footprints made from it but none for the Fly Creek.
EDIT: from dude making them on ebay "For some tents there are heavier or lighter grades of Tyvek available, but owing to the sized of these, only the regular Housewrap at 63 g / sq. metre works."
BigAgnes uses "Nylon Rip-stop 1200mm waterproof polyurethane coating" so what about this stuff: https://www.ebay.co.uk/itm/402451476051
Tyvek is light and cheap.