Hiking Backpacks for Kids by Age: 4 to 12
Kids' hiking pack sizes by age: 6 to 8 liters at 4 to 6, 10 to 18 liters at 6 to 8, 25 to 38 liters with an adjustable torso at 8 to 12. Fit by torso length, not age.
By age, the pack sizes that work are 6 to 8 liters at 4 to 6 years, 10 to 18 liters at 6 to 8, and 25 to 38 liters with an adjustable back at 8 to 12. Those numbers are a starting point, not a verdict. The spec that decides whether a pack fits is torso length, which is why a tall 7-year-old can wear a pack sold for 10-year-olds and a small 10-year-old cannot. Match the volume to the age band, then confirm the torso range on the spec sheet against a tape measure on your child.
Why age is only a starting point
Pack makers size children’s packs by body height or back length, not age. Deuter lists the Kikki for body heights of 98 to 130 cm (about 3 ft 3 in to 4 ft 3 in). Osprey gives the Ace 38 a torso range of 11 to 15 inches. Neither number maps cleanly to a birthday.
To measure torso length, find the bony bump at the base of the neck (the C7 vertebra) and the top of the hip bones (put your hands on the child’s hips, thumbs pointing back; the line between the thumbs is the iliac crest). The distance between those two points, measured down the spine, is torso length. A pack whose range includes that number will sit with the hip belt on the hips and the shoulder straps wrapping the shoulders without a gap. Below the range, the hip belt rides on the ribs; above it, the straps pull the pack off the back.
Children under about 8 rarely carry enough weight for a hip belt to matter, so packs for the youngest bands skip torso adjustment entirely and rely on a sternum strap to keep the shoulder straps from sliding off narrow shoulders.
Ages 4 to 6: 6 to 8 liters, nothing heavy
A 4-year-old’s pack carries a water bottle, a snack, a stuffed animal and a rain jacket. That is 6 to 8 liters. Anything larger invites the child to fill it, and a 5-year-old who starts a hike with 4 lb on their back will hand it to you by the second mile.
What matters at this age is a sternum strap, a pack that weighs under 12 oz empty, and a shape the child can open and close alone. Hip belts on packs this size are decorative; a webbing strap without padding does nothing on a 40 lb body.
Ages 6 to 8: 10 to 18 liters, the first real day pack
By 6 or 7 most children can carry their own water, lunch, a layer and a small first-aid pouch for a full day. That fits in 10 liters; 18 liters leaves room for a kids’ sleeping bag on a short overnight where an adult carries the rest. Deuter’s Junior, at 18 liters and about 14 oz, is the common pick for this band, and it still has no hip belt, which tells you how much load the maker expects: a few pounds.
Look for a hydration sleeve if your child drinks more from a hose than a bottle, and side pockets deep enough that a bottle does not eject on a scramble. Deep pockets are the most common complaint on packs in this band.
Ages 8 to 12: 25 to 38 liters with an adjustable back
This is the band where fit stops being optional. An 8-year-old carrying 10 lb of overnight gear needs a hip belt that actually transfers weight, which means a padded belt and a torso adjustment that can be reset as they grow. Deuter’s Fox 30 uses a sliding back system for that; Osprey’s Ace 38 has 4 inches of adjustment across an 11 to 15 inch torso range.
Volume depends on what you will let them carry. For day hikes, 25 to 30 liters holds a layer, lunch, water and a share of group gear. For overnights, 35 to 40 liters holds their sleeping bag, pad, clothes and a share of food, with an adult carrying the tent. The ages Amazon splits this band into (8 to 12 and 10 to 12) describe the same packs; what separates a 9-year-old from an 11-year-old is torso length and how much weight they can carry, not a different product.
How much a child should carry
The guideline most pack makers and pediatric groups quote is 10 to 15 percent of body weight, with the lower end for younger children and anyone new to hiking. In numbers:
- 40 lb child: 4 to 6 lb, which is the pack plus a liter of water and a snack
- 60 lb child: 6 to 9 lb
- 80 lb child: 8 to 12 lb
- 100 lb child: 10 to 15 lb
Weigh the loaded pack on a bathroom scale before the trip. A 38-liter pack with a 2.9 lb empty weight, a 1.5 lb sleeping bag, a 1 lb pad and 2 lb of water already weighs 7.4 lb before clothes or food, which is the whole budget for a 55 lb child. That is the argument for a lighter pack in the 8 to 12 band even if it has less volume.
Four packs that fit the bands
Deuter Kikki
Eight liters, 11 oz, with a sternum strap and a shape small hands can work. Deuter lists it for ages 3 and up and body heights of 98 to 130 cm, which covers most 4 to 6-year-olds. There is no hip belt, which is right for this age. Check price on Amazon
Osprey Daylite Jr
Ten liters and about 9 oz, with a hydration sleeve, side bottle pockets and a sternum strap. Retailers place it at roughly ages 5 to 10; it is the right size for the 6 to 8 band on day hikes and still works for a small 9-year-old. No torso adjustment, so a child who outgrows it moves to the next band rather than resizing. Check price on Amazon
Deuter Fox 30
Thirty liters plus 4 liters in the side pockets, about 2.6 lb, with Deuter’s sliding back-length adjustment, a padded hip belt and a sleeve for a 3-liter reservoir. Deuter rates it for ages 8 and up. It is the day-hike and first-overnight pack for the 8 to 12 band; confirm the back-length range on the current spec sheet against your child’s torso, since retailers list different figures for different model years. Check price on Amazon
Osprey Ace 38
Thirty-eight liters, 2.9 lb, torso range 11 to 15 inches with 4 inches of adjustment, designed for loads up to 25 lb. Osprey lists it for ages 8 to 15. One parent’s reports put a 54-inch 7-year-old at the smallest setting and a 57-inch 10-year-old at the middle, which is the clearest fit data published for any youth pack. For the 10 to 12 band on real overnights, this is the pack. Check price on Amazon
What to check before you buy
Measure torso length and compare it to the range on the spec sheet, not the age on the box. Weigh the empty pack; under a pound for ages 4 to 8, under 3 lb for 8 to 12. Check that the sternum strap adjusts low enough to sit across the chest, not the throat. For the 8 to 12 band, load the pack with 8 to 10 lb in the store and have the child walk; the hip belt should sit on the hips with the shoulder straps snug but not bearing the weight.
The pack is one piece of the kit. The sleeping bag it will carry is sized the same way, by height rather than age, and the rules for that are in sleeping bags for kids in cold weather. For a child too young to walk the trail, the pack is on you instead: see child carrier hiking backpacks. The full age-by-age kit list is in camping gear for kids by age.