Why not RipStop Wadding: (no need for extra weight of shell fabric )

[al b]

Even Pertex shells adds a significant weight overhead to synthetic wadding blankets / Quilts:

Why not just reinforce the wadding with “rip stop” grid and use inside a vapour bivi , perhaps with the innermost layer attached to removable(for washing) Pertex sheet?

Would also be more breathable and allow .adjustable numbers of layers

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