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The AC-12 Carbon may have sacrificed a bit of carbon fiber and clearcoat though, so if the FS-15 stays healthy, the extra couple of ounces you cant notice wont matter

I do wish they had zipper closures for added security

The Apex is built to withstand wear and tear and keep your belongings safe, thanks to its tough, waterproof outer shell and zippers

Or you can use one of the many membrane fabrics used on the shells of sleeping bags (like Mountain Equipment Drilite, or equivalent), creating a very lightweight bivvy bag thats snowproof and good for damp environments, but still with some breathability

Recycle a pizza box or reusable grocery bags