This is a chest strap for backpacks. It's designed to prevent shoulder straps from slipping. Some backpacks don't come with one, so it's very convenient to have one on hand. Perfect for a quick trip to the park♡ or when you need a backpack for a school excursion. When walking a bit, a chest strap helps to keep the backpack from slipping, making it much easier to walk♡. The length is adjustable, so it can be used for baby backpacks, mom backpacks, and even school backpacks. In this day and age, many people commute with backpacks so they can easily wash their hands. We also hear from people who have switched to bicycle commuting and then back to backpack commuting, saying they needed one! We highly recommend it for those people too. Also great for backpacks for school trips and excursions(^^♪ Adjustment: Total length can be adjusted from 20cm (for children) to 30cm (for larger sizes). Sizes vary for children and adults, but it's convenient because you can also adjust the size depending on the clothes you're wearing. It attaches to the shoulder straps with snap fasteners. The width of the shoulder strap opening is 6cm. However, the snap buttons fasten securely, so it can be attached even if it's a little tight. The length adjustment belt goes through the buckle so that it comes out in front, but depending on the size adjustment, one of the snap fasteners may be hidden. If you are concerned, please re-thread it to the body side. #nikoChest #ChestStrap #Handmade #BackpackSlipPrevention #BackpackBelt #SchoolBag #Excursion This product is made using soft acrylic tape. We also make chest straps using cotton fabric, so we would be very happy if you would take a look at our other products.