PackOS Pack

PackOS solves inaccurate shipping rates at checkout by using bin-packing logic to select the correct box for every order. When box size is estimated wrong, merchants either overcharge customers and lose sales, or undercharge and lose margin. This app determines which box an order actually fits in, then queries live carrier rates from USPS, UPS, FedEx, and other carriers for that specific package. Configure your box inventory once, set carrier preferences, and PackOS automatically handles accurate rate calculations at checkout. The bin-packing engine recommends the right box for each order, while configurable shipping rules let you control how rates are presented to customers.