Sack of Holding
The Sack of Holding is easily the most common rucksack of any type owned. Truly, it is a familiar item which is owned by most people across all of Saleh'Alire, regardless of class or stratum- arguably surpassing even the simple Backpack. After all: From the lowliest Slave, to the common Peasant Farmer, and even a Nobleman in his Kitchen ... Everyone, everywhere, needs a sack of some sort. And of course, all the better if it's enchanted with even a little extra space to put things in.