Comfort/Fit
The Guidepost has a Quickfit system which allows the user to make adjustments to torso length along a central plastic frame in the field. The upper back padding and shoulder straps are smoothly joined to build an ergonomic harness. The waist strap is simple and straight, with good flexibility and contouring with the padding. The sternum strap has a wide adjustability range, and didn’t get pulled out of place during use. 

Storage
There are two medium-sized zippered sleeves on the back of the pack and a large sleeve that extends the length of the bag. The body compartment is large and has an optional divider. The mouth of the body compartment is wide, and will easily fit a bear canister. The brain is removable and becomes a daypack. There are two buckled gear straps on the bottom. 

Stability
The pivot on the Thule Guidepost 75 was the best in the test set. The waist belt is mounted on a limited-range circular action, which allows the user to keep their load centered. The construction of the pack tends towards the tall, but this feature turns that pitfall into a strength of greater storage. 

Durability
One of the Guidepost’s biggest strengths is its durability. The zippers are wide gauge with large pulls. The exterior treatment of the bag adds water resistance and a good defense against abrasions. This toughness does come with a drag on the final trail weight of 5 lbs and 12 oz, tied for the heaviest pack in the set. 

Extras
The Thule Guidepost 75 does have one interesting feature that none of the other packs in the set had: USB cord integration included and a Goal Zero battery pack in a place under the hood specifically labeled “Power Pocket”. Putting aside the debate on whether or not increasing technological integration makes our backcountry forays safer or more enjoyable, this feature will be appreciated by the social media conscious. There is one mesh hip pocket and another that is removable and interchangeable, allowing for different options such as a waterproof, roll-top pouch, a water bottle sleeve, or another pouch. There are also two gear loops on the back. There is no whistle.