Greenroom136 Rainmaker vs. Boundary Supply Errant X-Pac

First, let's talk size and weight. The Greenroom136 Rainmaker and the Boundary Supply Errant X-Pac both offer a substantial 22 liters of storage space. However, the Rainmaker is a much taller entity at 40 inches compared to the X-Pac's 14 inches. That being said, the Rainmaker also tends to be more compact in terms of width and depth – 28 inches and 21 inches respectively, whereas the X-Pac spreads out to 29 inches wide and a whopping 48 inches deep. In terms of carry-weight, the Errant X-Pac is slightly lighter at 1.4 pounds when empty, and the Rainmaker is a little heavier, hitching a ride on your shoulder at 1.7 pounds.

• The Greenroom136 Rainmaker is taller but more compact
• The Boundary Supply Errant X-Pac is shorter, wider and deeper
• The Rainmaker weighs more, even when empty
• Both backpacks offer 22 liters of storage space

Moving on to materials, the Rainmaker boasts a durable make of 1000D Cordura, known to withstand the rigors of everyday use, while keeping your gears dry. The X-Pac, as could be deduced from its name, is made out of X-Pac material, another popular choice for outdoor gear renowned for its durability and water resistance. Compatibility-wise, the Rainmaker scores big with a 100% compatibility rating across airlines, while the X-Pac is compatible with 83% of carriers.

• The Greenroom136 Rainmaker is made from 1000D Cordura
• The Boundary Supply Errant X-Pac is made from X-Pac
• The Rainmaker is more universally compatible with airlines

The two bags are also designed with laptop compartments. Sized to house a 15-inch laptop, the Rainmaker’s laptop compartment is complimented by its sturdy and water-resistant exterior along with an array of customizable options. The X-Pac's laptop pocket can accommodate a larger, 17-inch laptop which is a nice feature for those not needing to travel light.

• The Rainmaker’s laptop compartment fits up to a 15-inch laptop
• The X-Pac’s laptop compartment fits up to a 17-inch laptop

In summary, the Rainmaker and X-Pac both have their unique offerings. Customer reviews rave about the Rainmaker's versatility and incredible customization options, appreciating its function over form approach, and many travelers consider it to be one of the best-value bags on the market. On the other hand, the X-Pac offers an accessible choice with a more substantial laptop compartment for those needing extra tech space. It's always a trade-off depending upon personal needs. But between these two bags, you've got options to meet all sorts of carry-on needs.