Swaddle Designs Transitional Swaddle Sack - Watercolor Mountains & TreesThe Transitional Swaddle Sack was created by a nurse and mom of two, and it is so special it has earned a patent for its design! The Transitional Swaddle Sack is the easy way to transition baby from the swaddle, and it is designed to bridge the gap between snug swaddling and a loose fitting sleeping sack. The Transitional Swaddle Sack is a very important innovation for babies who can roll over. The sacks ergonomic design features a snug midsection to