Birchbox Man Coupon: FREE Full-Size Jack Black Charcoal Body Bar Soap with Subscription! Posted by Hello Subscription on August 1, 2018. Subscription Box Coupons & Deals / Birchbox Man Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification For a limited time when you subscribe to Birchbox Man and use coupon code FRESHANDCLEAN you’ll get Full-Size Jack Black Charcoal Body Bar Soap FREE! Valid for new subscribers only. While supplies last.