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 in place, making it much easier to walk♡. The length is adjustable, so it can be used with baby backpacks for infants to mom's 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 to those people as well. Also great for school trip backpacks(^^♪ Adjustment: The total length can be adjusted from 22cm to 32cm. 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 a snap. It supports shoulder straps up to 6cm wide. #nikoチェスト #cheststrap #handmade #backpackslip-prevention #backpackbelt #schoolbag #excursion #camping Shape... Backpack/Backpack