SO is discontinuing X-Pac in favor of two new fabrics. EPLX400 and UltraPE 400. Looks to be better tear strength and abrasion resistance, a little lighter, quieter, and as waterproof. The UltraPE 400 looks very interesting.
https://www.rokslide.com/forums/threads/seek-outside-2022-pack-updates.252446/
https://seekoutside.com/lightweight-backpacks/
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