Sirmaeed F102 40L Expandable Travel Backpack

The Sirmaeed F102 is a 40-liter soft-sided travel backpack with an expandable section, multiple carrying options and a layout that opens 90–180 degrees. It is listed as fitting devices up to 17.3 inches, but airline carry-on and under-seat fit depend on the airline, fare rules and how the bag is packed.

At a glance

Expandable depth adds a listed 5 cm (2 in) when more packing space is needed.
The bag opens 90–180 degrees for packing and security access, and includes a luggage strap for rolling suitcase handles.
Top and side handles offer hand-carry alternatives to the adjustable shoulder straps.
A hidden pocket is intended for passports and IDs. The listing describes water resistance for light rain, not waterproof protection.

Price

$25.49Save 36%

Reference price: ~~$39.99~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

40-liter listed capacity, seven pockets and five compartments provide several ways to separate travel items.
Expandable depth and a wide-opening layout can help accommodate and organize clothing and trip essentials.
The luggage strap and top and side handles support different ways of moving the bag through a trip.

Cons

The soft-sided construction can change shape depending on packing, so the listed dimensions may not reflect an overfilled or expanded bag.
Water resistance is limited to light-rain protection. The listing advises protecting electronics from heavy rain.

Technical specifications

26 specifications

Identity and size
Model	F102
Capacity	40 liters
Dimensions	9"D x 14"W x 20"H
Weight listed	1.08 kg
Size	XX-Large
Color	Grey
Fit	one_size_fits_all

Organization and carrying
Pockets	7
Compartments	5
Maximum compatible device size listed	17.3 inches
Strap type	Backstraps
Harness type	Shoulder Harness
Strap size	Adjustable
Closure	Zipper

Materials and protection
Material	Nylon
Lining	Polyester
Shell type	Soft Shell
Water resistance listed	Water Resistant
Fabric stretch	No Stretch
Fabric weight class	Lightweight

Other listed details
Expandable depth increase	5 cm (2 in)
Opening range	90-180 degrees
Recommended use	Travel
Design	Laptop Backpack
Pattern	Solid
Age range	Adult

What to know before buying

The listing describes the bag as TSA and flight approved, but airline and fare size rules still apply. Expanded size may require check-in, and under-seat fit is not guaranteed. The manufacturer also warns that screen size alone does not determine laptop fit, and that comfort depends on load balance and packed weight. Not intended for people 12 and under.

Listing details to confirm

Listing details are inconsistent on size and fit: the product is called XX-Large, while the stated dimensions are 9"D x 14"W x 20"H, and claimed airline and under-seat suitability is not guaranteed. The 17.3-inch figure is a maximum compatible device size claim, not confirmation that every device of that screen size fits. Check the actual packed dimensions, laptop fit and airline limits before travel.

Who is it for?

A good fit for

Travelers wanting a 40-liter soft-sided backpack with expansion and multiple pockets for clothing and trip essentials.
People who value a wide-opening layout and a luggage strap for handling the bag alongside rolling luggage.
Buyers seeking a listed laptop-backpack design and willing to verify the fit of their specific device.

Less suited to

Anyone needing waterproof protection or a guaranteed under-seat or carry-on fit across airlines.
People who need a hard-sided bag or a confirmed fit for a particular laptop based only on its screen size.

Sirmaeed F102 40L Expandable Travel Backpack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 676 ratings

5 stars80%80%
4 stars9%9%
3 stars4%4%
2 stars2%2%
1 star5%5%

Customer feedback describes the backpack as practical for trips, with useful storage and reports of fitting overhead compartments and under airline seats. Those experiences may be relevant to its listed 40-liter capacity and pocket layout, but they do not guarantee fit under a particular airline's rules. Feedback is mixed on durability and zipper quality, with reports ranging from good service to the bag coming apart after a second use or zippers breaking after three months. The mostly five-star rating distribution is encouraging but does not resolve those durability concerns.

Positive themes

Customers describe it as practical for trips and appreciate its storage capacity and compartments.
Customers report that it fits in overhead compartments and under some airline seats.

Mixed feedback

Durability feedback varies, including reports of the bag holding up and reports of it coming apart after a second use.
Zipper feedback is mixed, with reports of strong zippers as well as failures after three months.

Frequently asked questions

Does the Sirmaeed F102 fit every airline's carry-on rules?

No universal fit is guaranteed. The listed dimensions are 9"D x 14"W x 20"H, and expansion or overpacking can change the bag's size. Check the airline and fare rules, especially if using it expanded.

Can it fit a 17.3-inch laptop?

The listing gives 17.3 inches as the maximum compatible device size, but also cautions that screen size alone does not establish device fit. Check the laptop's dimensions against the bag's actual laptop space.

Is the backpack waterproof?

No. It is listed as water resistant, with the manufacturer describing protection for light rain and advising protection for electronics in heavy rain.

How much extra space does expansion add?

The manufacturer says expansion increases depth by 5 cm (2 in). The expanded bag may exceed airline carry-on limits.