Padded, quick-attaching backpack harness or shoulder yoke for Savotta Keikka series duffel bags. All weight-bearing buckles are made of steel in the name of unreasonable strength and durability. As their intended host bags, these tough little pieces of gear can easily handle more load than their user hopefully ever has the misfortune to carry.
It's not like you really need to read the instructions so we put some funny content in there.
This harness was designed especially for Savotta Keikka duffel bags, which readily have D-rings as suitable mating points. Other bags may include similar details so these are semi-universal in that sense.
Although no duffel bag on your bag will ever come close to carrying a purpose-built rucksack when it comes to comfort, it's prudent to try to make it as un-uncomfortable as possible.
Mathieu G.