This was a perfect generic chest strap for fitting to a rucksack that my grandchildren were struggling to keep across their shoulders (only 5 years old), fully adjustable to fit a range of sizes. Great.
If your backpack doesn't have any (like my didn't) these are great to prevent the pack from swaying while hiking. It has kept my backpack locked to my upper body so has done its job!
This is an excellent product, suitable for most rucksacks. It is only 25% of the price of some branded alternatives, for what is essentially the same item.
loads cheaper than branded alternatives