KLOSTAIN 40 × 30 × 20 cm 24 L Underseat Laptop Backpack

Underseat: The KLOSTAIN Ryanair cabin backpack is listed at 40 × 30 × 20 cm with 24 L capacity, a padded laptop sleeve and five pockets. Its layout is aimed at short trips and airline travel, with water-repellent polyester and a dedicated compartment for damp items.

At a glance

Listing describes a padded laptop sleeve, main compartment with compression straps and a front pocket for travel documents.
Two side mesh pockets are described for a bottle or umbrella, alongside a separate wet pocket for damp toiletries.
An anti-theft back pocket and four side buckle straps are listed as travel features.
The listing claims compatibility with Ryanair, easyJet, British Airways, Wizz Air and Eurowings. Airline rules and fit can vary, so verify current baggage allowances.

Price

£29.98Save 19%

Reference price: ~~£36.99~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

24 L capacity and a compact listed size suit buyers prioritising an underseat-style travel bag.
Separate laptop, wet-item and quick-access storage can help keep common travel items apart.
Padded, adjustable shoulder straps are described for carrying through terminals.

Cons

At 15 inches maximum compatible device size, it is not listed for larger laptops.
Water resistance is described as water repellent, not waterproof.

Technical specifications

14 specifications

Identity and capacity
Brand	Guangzhou Yueke Leather Co., Ltd.
Capacity	24 Liters
Dimensions (D × W × H)	20D x 30W x 40H centimetres
Size variant	40x30x20cm-24L
Colour	Light Grey
Country of origin	China

Materials and protection
Material listed	100% polyester
Water resistance listed	Water Repellent
Shell	Soft Shell

Storage and carrying
Maximum compatible device size	15 Inches
Pockets	5
Closure	Zipper
Strap type	Padded Strap
Harness type	Shoulder Harness

What to know before buying

Listing details to confirm

The stated dimensions and airline compatibility are listing claims rather than a guarantee of acceptance. Check the airline's current allowance and measure the packed bag, as its shape and fullness may affect fit. The wet pocket is for separating damp items and does not establish that the bag is waterproof.

Who is it for?

A good fit for

Short-haul travellers looking for a compact carry-on backpack with organised storage.
Travellers carrying a laptop up to the listed 15-inch device size.
Buyers who want a separate wet pocket and quick-access travel storage.

Less suited to

People needing a backpack specified for laptops larger than 15 inches.
Travellers who need confirmed waterproof protection or guaranteed airline acceptance.

KLOSTAIN 40 × 30 × 20 cm 24 L Underseat Laptop Backpack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 8,450 ratings

5 stars78%78%
4 stars15%15%
3 stars4%4%
2 stars1%1%
1 star2%2%

Customer feedback highlights organised pockets, useful space for short trips, comfortable shoulder padding and a reported fit under budget-airline seats. Those impressions align with the listed 24 L capacity, five pockets and padded straps, but do not guarantee that every packed bag will meet an airline's size rules. Aggregate ratings lean positive, though ratings alone do not explain individual experiences.

Positive themes

Feedback describes the pockets as useful for organising clothing, toiletries and electronics.
Customers report comfort from the shoulder padding and practical use on short trips.

Frequently asked questions

What are the listed dimensions and capacity?

The listing gives dimensions of 20D x 30W x 40H centimetres and capacity of 24 Liters. It also describes the bag as 40x30x20cm-24L.

What size laptop does it accommodate?

The listed maximum compatible device size is 15 Inches. Check your device's measurements against the sleeve before buying.

Is the backpack waterproof?

No waterproof claim is supplied. Its listed water resistance is Water Repellent, and the feature text describes protection from light rain or spills.

Which airlines is it listed for?

The listing names Ryanair, easyJet, British Airways, Wizz Air and Eurowings. Confirm current baggage rules with your airline, since the listing does not guarantee acceptance.