Amazon has raised the maximum box length for sellers using its fulfillment services from 25 inches to 36 inches, effective June 20. This change allows sellers to optimize packaging and fit more products per box, potentially reducing processing costs. While other dimensional limits remain unchanged, Amazon noted that oversized boxes containing only a single large item may still be accepted if not excessively large. However, sellers could face additional fees or shipping restrictions for boxes deemed oversized. This adjustment aims to ease shipping compliance challenges and enhance efficiency in the fulfillment process.

Source: https://www.supplychaindive.com/news/amazon-fulfillment-maximum-box-length-change/752470/