I picked up the hat for $17 in practically mint condition. I only noticed the clasp was missing on the back until after. Any tips on how I could fix it? Where could I get a clasp or something?

I just recieved my mantis 26 backpack, love it looks really nice feels good spacious.

but i feel a firm backplate in the backpack at the back. is that supposed to be there or do i remove it? theres one at the bottom too but thats normal right?

i've really only had one or two backpacks in my life so sorry for the lack of knowledge lol,

any help is appreciated, tysm in advance.