Birchbox Man Coupon: Free S’well Bottle with 6-Month Subscription! Posted by Hello Subscription on May 16, 2018. Father's Day Deals & Gift Boxes / 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 for 6 months and use coupon code WATERBOTTLE you’ll get a FREE S’well Bottle (a $25 value!) Valid for new subscribers only. While supplies last.