Comfort/Fit
The comfort and fit of the Mammut Trion Pro 50+7 is defined by its design as an alpine summit bag; the padding is minimal, which is comfortable with light loads up to 30 pounds and is easy to get on even with a few layers and gloves on. The sternum strap has three settings that can be quickly changed, though only within  a narrow range. The frame is flexible and springy, which adds to comfort with light loads but takes away its ability to handle heavier loads. 

Storage
The main body of the Trion Pro 50+7 has a reliable water resistance treatment and a roll-top closure on top, which inspires confidence during wet conditions. The roll-top closure impacts the upward expandability of the body, but succeeds in keeping the center of gravity low and comfortable. The back sleeve closes with a cinch and runs the length of the bag and is well situated for accessible items such as a hard shell jacket or pants. The brain is easy to remove to save weight but does not convert into a fanny pack. 

Stability
The Trion Pro 50+7 ranked poorly in this category, notably because of its lack of hip belt pivot. This is especially noticeable when fully loaded. The body of the bag also compresses down well, for use when lightly packed. The body is tall, and when loaded it has a medium center of gravity, which is good, considering this bag is for alpine climbing that requires unimpeded movement. 

Durability
The Mammut Trion Pro 50+7 has a solid construction. The basic plastic buckles are light but could be a cause for concern when very cold temperatures make plastic brittle. The band that forms the roll top closure is reinforced. The zipper on the brain is small gauge but is covered to add water resistance. 

Extras
This Mammut bag is packed with extras that aid in its role as an alpine summit bag, such as two smaller gear loops on the back for trekking poles or ice tools, and two larger loops that can accommodate a pair of skis. The brain is easily removed for the most weight-conscious users. The sternum strap has a whistle. The waist strap also has webbing that can be used in the same way as a harness gear loop.