So we bought a soft carrier because our cats are just the worst when it comes to going into a carrier. They love to start bouncing around when we are actually carrying them so naturally it causes a weight shift and the carrier will tip. When they did this in the plastic ones it used to terrify me for 2 reasons. One being that the poor babies were slamming into hard plastic but also I was terrified the carrier would pop open and they would fall out. This is much softer so when they decide to do gymnastics as I am carrying them into the vet I feel slightly less guilty when they bump into the sides but also it has a shoulder strap so it makes it easier to hold it close to my body so there is less movement of the carrier itself.