infant stroller sack. This award-winning design is a must-have stroller accessory for fall and winter. The fully fleece-lined sack attaches to the stroller and zips up over your child to keep them warm and cozy all day during the colder months. The stroller sack is produced by Eckert, a German company who has been making childrens accessories since 1952. The quality and craftsmanship of this functional, stylish design is exceptional. Kid O carries two sizes, an infant sack measuring approximately 30 inches in length, and a toddler sack measuring approximately 40 inches in length. Machine-washable.