I received two of these as a gift and I can't imagine not having them now. I first put them on my climbing harness for ice climbing and they stayed on all year round. They are great to rack lots of different gear items during any season. I now use them, the Petzl specifically, on my backpacks as well. Some packs have the ice clipper slots that will allow other brands to work well but he caritools will attach well to many packs because of the slot at the back. I clip everything from trekking poles, gloves, water bottles, to camera gear.