When comparing REI Trail 40 Pack vs Patagonia Headway MLC 45L, the Slant community recommends REI Trail 40 Pack for most people. In the question“What are the best carry on backpacks for travel that hold at least 30L?” REI Trail 40 Pack is ranked 3rd while Patagonia Headway MLC 45L is ranked 24th. The most important reason people chose REI Trail 40 Pack is:
There is a [women-specific version](http://www.slant.co/topics/5119/viewpoints/7/~carry-on-travel-backpacks-for-women-that-hold-at-least-30l~rei-trail-40-pack-women-s) of the REI Trail 40 available, which has a slightly smaller torso fit range.
Ranked in these QuestionsQuestion Ranking
Pro Women-specific version available
There is a women-specific version of the REI Trail 40 available, which has a slightly smaller torso fit range.
Pro Pockets on the hip belt for easy access
The hip belt has two zippered pockets which lets you store things for easy access (such as papers, money or snacks).
Pro Four zipper access to easily get to your belongings
The pack is front load with four zipper access, allowing you to unzip from either the top or bottom. This is great if you want to grab something from the bottom of your pack without opening it completely.
Pro Includes raincover
The pack comes with a rain cover that stows away in it's own zip pocket.
Pro Plenty of pockets for organization
There are many pockets on both the inside and out to help you stay organized.
Pro Can be used as a duffel
This is a convertible pack that can also be worn/used as a duffel bag.
Con Pocket for hydration reservoir is difficult to access
The pocket for the hydration reservoir is external, located right behind the back panel. There is very little room, making it hard to access and can only fit a small amount of water (around 1.5L).
Con Internal bungee compression system can get in the way
The internal compression straps are a bungee system, which does not unclip the way most do. When your pack is full, this can make it a very tight squeeze if you want to access something in the back.
Con Straps have very little padding
The shoulder straps are only lightly padded, which can be uncomfortable if the bag is worn for long periods.