Cotopaxi Allpa 35L vs. Boundary Supply Errant X-Pac

Let's start off with the Cotopaxi Allpa 35L. One look at the measurements will tell you this is a voluminous bag, standing 20 inches tall with its dimensions of 30 inches wide and 51 inches deep, offering a generous luggage space. The Allpa 35L is a little more bulky compared to its opponent, the Errant X-Pac, weighing in at 1.5 pounds, but it more than makes up for its weight with its carrying capacity of 35 liters. And of course, we can't miss the fact that the bag is 80% airline compatible, ideal for those who prefer jetting off in a jiffy. It's crafted from durable 1680D ballistic nylon paneling, and can comfortably hold a 15-inch laptop in its compartment. Reviewers praised the Allpa 35L for its internal organization and convenience, deeming it a top choice for those who value simplicity, comfort, and durability.

In the other corner, we have the light-weight Boundary Supply Errant X-Pac, which weighs about 1.4 pounds. It has a carrying capacity of 22 liters, and fits most airlines' carry-on size regulations at an impressive 83% compatibility rate. The Errant X-Pac may be shorter than the Allpa 35L at just 14 inches tall and 29 inches wide, but it can pack a mean punch – its compartment can accommodate laptops up to 17 inches. Furthermore, it's crafted from X-Pac, a sturdy, ultra-light, water-resistant and durable material.

Here's a quick recap to compare the two:

• Size: Cotopaxi Allpa 35L is larger & Boundary Supply Errant X-Pac is smaller.
• Weight: Both bags weigh close to each other, with the Errant X-Pac being slightly lighter.
• Capacity: Allpa 35L has a significantly larger capacity.
• Airline Compatibility: Errant X-Pac is more widely accepted by airlines.
• Material: Allpa 35L uses 1680D ballistic nylon & Errant X-Pac uses X-Pac.
• Laptop Compartment: Errant X-Pac can house a larger laptop.

The Allpa 35L was lauded by reviewers who cited its impressive internal organisation and durability. They found it convenient and praised its inclusion of a rain cover, collapsible mesh laundry bag, nylon shoe bag, and mesh water bottle sleeve. The Errant X-Pac didn't get a mention from reviewers, but it still packs a few surprises up its sleeve, like being able to pack a larger laptop, for instance.

Looking at both bags, these are two hard-hitting carry-on backpacks that cater to different users. The Cotopaxi Allpa 35L fits the bill for those who value internal organisation, high volume space, and added extras. Alternatively, the Boundary Supply Errant X-Pac may be more suited to those who prefer a compact and lighter backpack, without compromising on the ability to carry larger devices.