Greenroom136 Rainmaker vs. Macpac Rapaki 25

Let's talk about two impressive carry-on backpacks in the market - the Greenroom136 Rainmaker and the Macpac Rapaki 25. Starting with the former, the Greenroom136 Rainmaker stands tall at 40 inches, has a width of 28 inches and a depth of 21 inches. With a weight of 1.7 lbs, it's a bit on the heavier side but makes up for it in capacity, offering a full 22 liters. It's compatible with virtually all airlines and is crafted with 1000D Cordura material, famed for its resilience. A separate compartment fits a 15-inch laptop, making it an ideal choice for digital nomads or business travelers.

On the other hand, the Macpac Rapaki 25 is a bit more compact at 25 inches of height, 30 inches wide, and 52 inches deep. It's light as a feather, weighing just 0.91 lbs, and flaunts a generous 25 liters of capacity. Compatibility could be an issue though, as it works with only 47% of airlines. The long-lasting 200D Recycled Polyester combines with 420D Oxford Nylon in its construction and it too offers a laptop compartment for a 15-inch machine.

Here's a quick comparison list of these carry-on backpacks:

• Size: The Rainmaker exceeds in height but the Rapaki 25 has it beat when it comes to width and depth.
• Weight: The Rapaki 25 leads, weighing less than Rainmaker by 0.79 lbs.
• Capacity: The Rapaki 25 offers three more liters of capacity compared to the Rainmaker.
• Material: The Rainmaker is made of a sturdier material, while Rapaki goes for a mixture of recycle and lightweight materials.
• Compatibility: Hands down to Rainmaker being compatible with all airlines, Rapaki only meets halfway.
• Laptop Compartment: They both can accommodate a 15-inch laptop.

Reviewers have praised the Rainmaker's functionality and the customizability it offers. They rave it's the "complete package" for a laptop-carrying everyday pack. In contrast, they claim the Rapaki 25 offers the best value in the market, proven by months of living out of it and testing a variety of other bags.

In conclusion, the Rainmaker is versatile, with lots of customization options and a sturdy, water-resistant exterior. If organization is your mantra, it's your best bet with its compartments that keep everything in place. The Rapaki 25, meanwhile is for those looking for lightweight comfort and a larger capacity, with impressive value for money. Both these backpacks offer something for everyone, which one aligns better with your travel requirements is for you to decide.