Where Should the Bottom of a Backpack Sit?

In the curve of the lower back, and never more than four inches below the waistline, according to AOTA’s advice for children.

Published October 27, 2026 · 3 min read · Topic: Size, Fit & Comfort · Size & fit

Typical situation

Your child’s backpack hangs down over the hips, and you want to know how high it should sit.

Main answer · berabags Editorial Team · Fit view

The bottom of the pack should rest in the curve of the lower back, and AOTA says it should never rest more than four inches below the waistline. The NC State Ergonomics Center adds that the pack should fit between the base of the neck and the top of the hip bones.

What the sources say

AOTA says that the bottom of the pack should rest in the curve of the lower back and should never rest more than four inches below the child’s waistline.
It says that school backpacks come in different sizes for different ages, so choose the right size for the child.
The NC State Ergonomics Center says that the pack should fit between the base of the neck (the C7 vertebra) and the top of the hip bones (the iliac crest).
It says that most users may not know that backpacks come in small, medium and large sizes, which should match the user’s body.

How to check

Put on the loaded pack and tighten the straps.
Stand straight and ask someone to look from the side.
Check that the bottom is not far below the waist.
Check that the top of the pack does not rise well above the shoulders.
If it is wrong, adjust the straps or change the pack size.

Common causes of a low pack

A strap that is too long, a pack that is too large for the torso, or a heavy load that pulls the pack down.

Where this answer stops

The four-inch figure is from advice for children. Adults can use the second source’s idea, that the pack should fit the torso between the neck base and the hips.

Sources and further reading

Three more perspectives

berabags Editorial Team · Fit view

Look from the side. The pack should sit against the back between the shoulders and the lower back, not hang down over the hips and bottom.

berabags Editorial Team · Purchasing view

If the pack is too long for the torso, a shorter or smaller pack is the answer. Straps alone cannot fix a pack that is the wrong size.

berabags Editorial Team · Maintenance view

Re-check as children grow. A pack that sat well last term may hang low now, and growth is the reason adjustments need repeating.

Independent and unofficial. berabags is an independent editorial site. It is not affiliated with, endorsed by or sponsored by any bag brand, retailer, airline or agency named on this page. This page contains no affiliate links; if berabags adds any in future they will be labelled. Rules and policies change, so check the linked source before you act. This is general information, not legal, medical or professional advice.