Modern structured hip carriers, soft structured carriers (known as SSC) which can be used on front, back or hip. Soft structured carriers are a hybrid between a tie on carrier and a rucksack, structured front packs and hard framed backpacks are also used. Hip carriers may be closely related to ring slings or they may be more closely related to a tie on carriers, but this type of carrier has structured waist padded shoulder straps and several different types of fasteners are used in different models. Most soft structured carriers are loosely based on the traditional tie on carriers with a main flat panels and four straps which are shortened and fitted with buckles for added convenience The advantage of the buckles is that the shorter straps do not trail on the floor, which can be useful in winter/wet weather. They can be very easy and comfortable to use.