I think it could be an isopod but am unsure. It doesn't look like ones I am familiar with in houses (usually basements, which is not where this is).
It is about 10mm or 3/8" long, seems to move towards the top of the picture (but mostly is just wiggly), and is slightly hairy. Western USA.
I'm almost certain that's a dermestid larva. I've seen lots over the years. They're mostly harmless, though a sign that maybe you should do a bit deeper of a 'spring cleaning.' If you are a fiber fiend (spinner, knitter, crocheter, etc.) or someone who likes natural fibers they can be bad news because they can munch your stuff if it's left around enough.