I bought one of these bags to go along with their "Coffin" bag. It also works great, and doesn't scream "gun".

https://smile.amazon.com/dp/B085HLHXGH/ref=cm_sw_r_cp_apa_glt_fabc_6P5XDWWTQGZ3GWG2YG9V?_encoding=UTF8&psc=1