About What is a Backpack? Backpack vs. Rucksack vs. Knapsack - Picvalue CorpWhen it comes to the bags we carry on our backs, the difference between backpacks, rucksacks, and knapsacks can be confusing to you as people use these terms interchangeably. However, this difference exists, albeit discretely. So, what is a rucksack and does it have some unique features?Today, we're going to tackle the endless debate about loads rucksack vs. backpack vs. knapsack and give you a better understanding of these products.