One of the major differences between these two bags is clear right from the names: the Peak Design is a sling bag, where the strap goes around your body and the pouch rests against your front or back.

It can be used on its own but I found it to be the ideal companion to PD’s Outdoor Backpack I reviewed. Detach the padded cross-body strap and the $59.95 2L Outdoor Sling can be secured to the ...