What criteria should be used to choose between the SM and ML sizes of the Baekdu 2 backpack?
Since the backpack capacity is divided into 55L and 57L, it is easy to wonder whether to choose based on load size. The question arises when one cannot clearly determine what the torso measurement shown in the detailed description specifically means.
Rather than the difference in load capacity, you should choose a backpack that fits your body based on your torso measurement, which corresponds to your back length.
The torso measurement indicated in backpack specifications refers to the actual back length from the protruding bone at the back of the neck when bowing your head down to the top of the hip bones. To evenly distribute the backpack's load between the shoulders and waist and walk stably, this back dimension must fit your body.
CAYL's Baekdu 2 backpack is designed according to torso length, with the SM size at 41~47cm and the ML size at 47~53cm[1]. Regarding the capacity between the two sizes, the SM size is 55L and the ML size is 57L, with a difference of only 2L[2]. Therefore, rather than considering how much more gear can fit, it is desirable to measure your own back length directly and choose the size that fits your body.
The recommended selection criteria when a person's body type falls right on 47cm, the torso boundary between the two sizes, have not yet been confirmed.