In short
Lässig offers three school backpacks with 21 litres each: the Slim Unique is narrow and sits close to the body, the Boxy Unique is a sturdy box shape with plenty of organisation, and the Light Unique is the lightest at around 960 g. The Slim suits petite children, the Boxy suits those who like order, and anyone wanting to save every gram should choose the Light.
All three models have an adjustable back section as well as a chest and hip strap, and come as a set with a rain cover. The Slim and Boxy also feature reflectors on the front and sides. The differences lie in shape, weight, compartments and set contents. Here's an overview, plus which model suits your child best.
Lässig school backpacks: comparison table
The figures are taken from the manufacturer's product information. Weight and dimensions apply to the backpack without set accessories.
| Slim Unique | Boxy Unique | Light Unique | |
|---|---|---|---|
| Shape | narrow, close to the body | fixed box shape | light, slim |
| Backpack weight | approx. 1.1 kg | approx. 1.17 kg | approx. 960 g |
| Set weight | approx. 1.99 kg | approx. 1.92 kg | approx. 1.59 kg |
| Volume | 21 l | 21 l | 21 l |
| Dimensions (W x D x H) | 30 x 25 x 39 cm | 30 x 25 x 42 cm | 30 x 25 x 40.5 cm |
| Back panel | infinitely adjustable XS to L | height-adjustable | infinitely adjustable XS to L, IGR-certified |
| Compartments | front compartment for the lunch box, side pocket for the water bottle, key finder | book compartment, wet compartment, insulated front pocket, key finder | organiser and mesh compartments |
| Set | 7-piece | 7-piece | 6-piece |
All three models are available in several colours and patterns. You'll find the current selection among the Lässig products.
The three models at a glance
Slim Unique
narrow and close to the body
The slim shape doesn't stick out to the sides and suits petite children well. The back panel adjusts infinitely from XS to L, and the back and straps are padded with breathable mesh. The large front compartment fits the lunch box.
LässigLässig School Set Slim Unique21 l, approx. 1.1 kg, back XS to L
Boxy Unique
sturdy and organised
The fixed box shape keeps exercise books and books in good condition. A dedicated book compartment, a wet compartment and an insulated front pocket create order. This suits children who like to know where everything is.
LässigLässig School Set Boxy Unique21 l, approx. 1.17 kg, box shape
Light Unique
around 960 g
The lightest Lässig backpack. The carrying system is IGR-certified, the back panel adjusts infinitely from XS to L, and the hip and chest straps are removable. According to the manufacturer, it's designed for children up to about 152 cm tall.
LässigLässig School Set Light Unique21 l, approx. 960 g, IGR-certified
Secondary school
30 l backpack
From around fifth grade, a school backpack starts to feel tight. The School Origin Bold has a height-adjustable back panel, an extra compartment for a tablet and a phone pocket with a headphone outlet.
LässigLässig School Origin Bold30 l, approx. 1.29 kg, tablet compartment
The Flexy Unique from our previous comparison is currently unavailable. Anyone looking for a light, sporty model will find the Light Unique the lightest alternative.
Which Lässig backpack suits which child?
- Petite or small children: Slim Unique. The narrow shape sits close to the back and barely protrudes to the sides.
- Children who like order: Boxy Unique. The book compartment and box shape keep everything in its place.
- Long school commutes or lighter children: Light Unique. Every gram saved on the backpack is more room for books and a water bottle.
- For all three: Let your child try on the backpack with a bit of weight inside. It should end roughly at shoulder height at the top edge and not reach lower than the hips.
To find out how to properly assess back length, weight and fit, read our guide Which school backpack is right for you?. You'll find more models among our school backpacks, for example from Step by Step.
What's included in the Lässig school backpack set?
The Slim and Boxy come as a 7-piece set. Alongside the school backpack, this includes a gym bag, a pencil case, a utility pouch, a neck pouch, a rain cover, as well as tags and patches. With the patches, your child can personalise the backpack and change the design later on.
The Light set has 6 pieces and focuses on the backpack itself: according to the product description, it includes a removable hip and chest strap, a rain cover, as well as patches and stickers. Matching pencil cases are available separately.
Lässig school backpack for secondary school
When moving up to secondary school, most children switch to a backpack. Lässig offers the School Origin Bold for this, with around 30 litres of volume. It has a height-adjustable back panel, a padded, breathable back section, a removable hip strap, a height-adjustable chest strap and reflectors on the front and sides. The reinforced base helps it stand stably.
You'll find more choice among our school backpacks, for example from Coocazoo. To find out which Coocazoo model suits your child, see our Coocazoo model comparison.
Care: how to keep the backpack looking good for longer
According to the manufacturer, the Slim and Boxy are made from dirt- and water-repellent material, while the Light is impregnated. For everyday use, a damp cloth with a bit of mild soap is usually enough. Empty the backpack completely on a regular basis so no crumbs or spilled drinks are left in the corners. For advice on dealing with stubborn stains, see our guide How to wash a school backpack.
Frequently asked questions about Lässig school backpacks
What's the difference between Slim, Boxy and Light Unique?
All three have a volume of 21 litres and a base of 30 x 25 cm. The Slim is narrow-cut and sits close to the back, the Boxy has a fixed box shape with a book compartment and wet compartment, and the Light is the lightest model at around 960 g. The Slim and Boxy come as a 7-piece set, the Light as a 6-piece set.
Which Lässig school backpack is the lightest?
The Light Unique: according to the manufacturer, the backpack alone weighs around 960 g, and the complete set about 1.6 kg. The Slim Unique weighs around 1.1 kg, and the Boxy Unique around 1.17 kg.
What's included in the Lässig school backpack set?
The 7-piece set for the Slim and Boxy includes, alongside the school backpack, a gym bag, a pencil case, a utility pouch, a neck pouch, a rain cover, as well as tags and patches. According to the product description, the 6-piece Light set includes a removable hip and chest strap, a rain cover, as well as patches and stickers.
Does a Lässig school backpack grow with the child?
Yes. On the Slim and the Light, the back panel adjusts infinitely from XS to L, and the Light is, according to the manufacturer, designed for children up to about 152 cm tall. On the Boxy, the back section and carrying straps are height-adjustable.
How heavy can a packed school backpack be?
A good rule of thumb is: no more than about ten percent of body weight. A lighter backpack leaves more room for books, a lunch box and a water bottle. Pack heavy items close to the back and only bring what's needed for the day.
When does it make sense to switch from a school backpack to a bigger backpack?
Usually when moving up to secondary school. Books and exercise books get bigger, and a backpack with around 30 litres offers more space. Lässig offers the School Origin Bold for this, with a height-adjustable back panel.
- Which school backpack is right for you? Buying criteria and fit
- Starting school: checklist, celebration and school backpack
- Coocazoo school backpacks compared
- How to wash a school backpack: methods at a glance
Everything for school: school accessories, gym bags, pencil cases and water bottles.
