This is a Mammut helmet holder. I've used it a few times, but I'm selling it because I don't have a need for it anymore. The following is from the official website: A helmet holder that can be attached to the outside of a Mammut backpack. The helmet is safely stored in a flexible material, making it easy to carry. ・Sewing pattern: Basic Features ・Elastic material allows use with backpacks of various capacities ・(one size) Height (cm) approx. 17.0cm Width (cm) approx. 17.0cm [Shipping] ・It will be folded compactly and shipped in simple packaging via anonymous delivery. ・Wrinkles may occur. ・It may be compressed for shipping. [Other] ・I may have overlooked something due to amateur inspection. ・Please understand that this is a used item that has been in someone's hands once before purchasing. ・Please refrain from purchasing if you are sensitive to such things. ・The color may differ slightly from the actual product depending on your device.