WATERFLY Sling Bag Crossbody Backpack - Spacious 18L Daypack

In this review the WATERFLY Sling Bag Crossbody Backpack is examined as a practical everyday daypack for commuters, hikers and travelers who need organized storage without bulk. The single biggest reason to buy is its thoughtful combination of an 18L capacity with multiple compartments that keep essentials accessible while maintaining a slim, comfortable carry profile. The reviewer found the bag comfortable for long wear, protective enough for a 13 in laptop, and versatile for activities from cycling to amusement parks.

Key Features

• 18L large capacity: The main compartment fits a 13 in laptop and leaves room for a water bottle, small camera or packed snacks for day trips.
• Multi-compartment layout: Seven pockets provide dedicated spots for cards, phone, cables and small items so things do not shift during movement.
• Innovation umbrella pouch: A zippered mesh net at the bottom isolates a wet umbrella or towel to keep the rest of the bag dry.
• Adjustable, changeable strap: The shoulder strap reverses for right or left shoulder carry and adjusts from about 25.9 to 46.5 in to fit different torso sizes comfortably.
• Breathable comfort padding: Soft padding on the back and base cushions contents and helps airflow when the bag is worn for extended periods.
• Water resistant fabric: The linen-like material resists light wetting and abrasion, making it easier to clean after outdoor use.

Who It's For

The bag suits day hikers, city commuters and travelers looking for a compact carry-on or crossbody that still holds a small laptop and everyday essentials. Its multiple pockets and side water bottle holder make it particularly useful for amusement park days, cycling and short overnight trips where organization matters.

Those who need a full-size backpack for multi-day backpacking, heavy camera rigs or larger laptops should look elsewhere, since the 18L capacity and sling format are designed for light, organized carry rather than bulky loads.

Pros & Cons

Pros

• Roomy main compartment that comfortably fits a 13 in computer while keeping other items separated.
• Thoughtful storage including a hidden back pocket and shoulder strap pocket for cards and phone under 5.8 in.
• Durable, water resistant material and a mesh umbrella pouch that isolates wet items without soaking the interior.
• Comfortable for long wear thanks to breathable padding and an adjustable strap that converts sides.

Cons

• The sling format limits load distribution compared with a two-strap backpack, so it is not ideal for heavy or very long hikes.
• Not suitable for laptops larger than 13 in or for travelers who need extensive packing space.

Specifications

Capacity	18L
Fits laptop	Up to 13 in
Pockets	Seven pockets including hidden back pocket and shoulder strap pocket
Strap length	Adjustable 25.9 - 46.5 in (66 - 118 cm)
Special features	Mesh umbrella pouch, water bottle holder, headphone hole
Material	Water resistant linen-like fabric

Our Verdict

The WATERFLY sling bag is a strong choice for anyone who wants a compact, organized daypack that handles a 13 in laptop and daily essentials with comfort and durable materials. It represents good value for commuters and travelers who prefer a single-strap crossbody for short outings, while those needing larger capacity or full load support should consider a traditional backpack instead.

Frequently Asked Questions

Can this bag carry a 13 in laptop?
Yes, the main compartment is sized to accommodate a laptop up to 13 in.

Is the shoulder strap reversible for left and right carry?
Yes, the strap can be switched for right or left-handed use and adjusts between about 25.9 and 46.5 in.

Will wet items damage the interior?
The bag has a zippered mesh net storage at the bottom for wet umbrellas or towels to keep moisture separated from other contents.