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Just went to the Extremtextil shop here in Berlin that opened recently. Among other things I asked about bivvy bags and laminates, and if it has to be 3 Layer. He said no.
Way I understand it the 3rd layer is so you don't need a lining to protect the membrane.
I am no materials expert, but in my understanding this material which is 65g for the base and this one which is 100g for the upper should work nicely.
And they're 4,90€ and 7,90€ respectively.If there wasn't so much sewing to do already I would make one for myself, my army gore tex one weighs around a kilo.
It’s why for the time being I can only make with what comes through as recycled or remainder at a local scrap store, charity shop, or craft swap type arrangement. The local sewing shop wants £15 for cordura-esque material and they cannot even tell me what dernier or manufacturer it has come from. I suppose if I asked them about floral cotton they’d know more.
New tech materials are notoriously expensive, I believe part of the cost when you buy from some makers is actually their covering the bulk purchase. Say they get material at £7 instead of £15, you’re still paying them a premium of £20 or £30 to cover the extra costs involved in the bulk order, storage, and so on.