Some bags will have none, some will have one strap and others will have both. Chest and waist straps: These can help take stress off the upper body.Check to ensure the straps are adjustable and can be tightened so the bag doesn’t sit below the lower back. Shoulder straps: Shoulder straps should be curved for a proper fit and padded to reduce stress on the upper body.Organizational compartments: This will vary by age, but consider whether your child needs a laptop sleeve, multiple zippered compartments, interior pouches and side pockets for water bottles.For a kid who is rough on their bag, consider one with a reinforced bottom. Materials: Nylon is the strongest backpack fabric, but polyester has also held up well in our tests.Just make sure that it can hold relevant school supplies a notebook and folder may be necessary for kindergarten, but they don't always fit in backpacks designed for 5-6-year-olds. If your child is in between sizes, you may have to size down to avoid them carrying a bag that's too bulky for their frame. Some brands offer multiple sizes for each style, while other backpacks are intended only for certain age groups. Size: Check the chart or listing to ensure the bag is the right size for your child.There's no one-size-fits-all solution when it comes to backpack buying, so it's essential to consider your own kids' needs based on their size and grade level. It's then inspected and scored based on signs of damage and repeated for a total of three drops. Drop test: The backpack is filled with a standard weight to mimic a real load, then mechanically dropped from a 3-foot height.It's then assessed against a visual standard to check whether water has seeped into the fabric. Water resistance: Lab pros use a spray test method, which means water is poured onto the fabric from a device that controls the amount and flow rate.Abrasion resistance: Swatches of the bag are loaded into our abrasion machine (pictured above), then rubbed against a rough material 15,000 times and visually scored for signs of damage.Fabric strength: Our specialized machine, called an Instron, pulls apart swatches of backpack fabric to see how much force is needed to break the material.Packing test: Using a standard load for each age group, our analysts pack each bag and note whether it can fit the entire assortment.Weight: Analysts record the empty weight of the backpack to make sure the bag itself won't weigh kids down.Strap padding: We measure the thickness of the shoulder straps to make sure there is adequate padding to alleviate stress on the upper body.Design features: The bags are thoroughly inspected and scored on whether or not they have padding for the shoulders and back, pockets for water bottles and electronics, straps for the shoulders and waist and compartments for organization.Our analysts then put the backpacks through the wringer to check for durability, performance and ease of use. First, we separate the backpacks by their intended age groups to account for differences in size, capacity and other features.
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