Shoulder Poppers and Side Zip * Parents swear by Grobags as an alternative to fussing with blankets and sheets, and their sound-asleep babies agree. Keep your little one cozy and snoozing safely with our selection of whimsically printed sleeping bags, along with other naptime essentials. This travel grobag can be used as per usual in a crib but has specifically designed additional features that makes it suitable for use in a car seat. The travel grobag has a two way zip which can be closed around a 5 point harness or at the base of the grobag under the zip click as per normal. It also has back vent to allow a harness strap to be fastened, the vent has velcro fastening so when not in use the travel grobag can be sealed and used as any other grobag.