Snack Sack Sale: 25% Off Subscriptions! Posted by Hello Subscription on September 8, 2017. Subscription Box Coupons & Deals / SnackSack Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification SnackSack is having a subscription sale! Save 25% off any subscription with coupon code SMART. FYI – Snack Sack now offers vegan & gluten-free options!