Cotopaxi Allpa 35L vs. Fjallraven Vardag 25

The Cotopaxi Allpa 35L and the Fjallraven Vardag 25 are both excellent carry on backpacks, each with their own unique attributes and strengths. The Allpa 35L from Cotopaxi, known for its rugged and functional outdoor gear, is a dandy piece of hardware that boasts of a massive 35-liter capacity, much more than the Vardag's 25 liters. It's also considerably larger in dimensions, making it ideal for longer trips. Featuring a laptop compartment that can hold up to a 15-inch laptop, it's also a great companion for tech-savvy travelers. Meanwhile, its 1680D ballistic nylon paneling ensures it can weather any storm, while the rain cover adds an extra layer of protection.

However, it's not all about size. Although smaller and lighter, Fjallraven's Vardag 25 is not to be discounted. Weighing in at only 0.48 pounds, compared to the Allpa's 1.5 pounds, it's a blessing for backpackers aiming to travel light. Also, its 14.5-inch height and 31-inch width give it a compact feel, while still having a respectable cargo capacity. Made from a mix of polyester and cotton, it's crafted keeping durability and eco-friendliness in hand. And while it doesn’t feature a laptop compartment, it makes up for it with its lightweight and minimalistic aesthetic, making it fit well in urban and casual settings.

Here's a quick rundown of the differences:

• The Allpa 35L has a bigger capacity of 35 liters, while the Vardag 25 sits at 25 liters.
• The Allpa 35L is larger and weighs more (1.5 pounds) than the Vardag 25 (0.48 pounds).
• The Allpa 35L is compatible with 80% airlines, while the Vardag 25 is compatible with a slightly higher 84%.
• The Allpa 35L's construction is 1680D ballistic nylon, whereas the Vardag 25 is made of a more eco-friendly G-1000® HeavyDuty Eco S material.
• The Allpa 35L comes with a 15" laptop compartment while, unfortunately, the Vardag 25 has no separate compartment for laptops.

Wrapping it up, these backpacks demonstrate their qualities through not just capacity and material, but also in their additional features. The Allpa 35L is equipped with comforting shoulder straps, hip belt, and adjustable sternum straps, as well as handy inclusions like a collapsible mesh laundry bag, nylon shoe bag, and a mesh water bottle sleeve. Meanwhile, the Vardag 25 pulls its weight with a foam seat pad and a sleek, minimalistic look that's suitable for most scenarios. Both these bags hold their own, tailored for different needs and preferences, ultimately offering robust functionality in their respective classes. The choice between the two depends on the specific needs of your journey. Whatever the need may be, rest assured, both bags rarely disappoint.