The first to officially move toward the modern backpack was Henry Merriam. In 1878, Merriam was issued a patent for his Knapsack: a pack which used an external sheet-metal frame.
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Books and supplies had to be carried to and from the classroom, and backpacks became a necessity ever since. Back in the 40s and early 50s, kids would carry backpacks made from leather or canvas. These were much more sophisticated than the ones young students use today!
In the years between 1960-1969 backpacks were plain and were mostly made using leather, wood, or canvas materials, they were quite minimalistic and quite distinguishable when put in comparison with the modern vintage retro backpack designs.
By the 1980s, student backpacks were fully integrated into the checklist of necessary school supplies. While the original student backpack came about organically in response to practical student needs, novelty backpacks that are made mostly with aesthetics in mind have become popular in more recent decades.
In the 50s, with the end of the world war, traveling expanded more than ever before and people wanted a vessel to carry their luggage. Briefcases for the formal businessmen, messenger bags for a day-worker, backpacks for students and military, retro duffle bags for light travelers were in the vogue in the 1950s.
You are never too old to travel. You just have to know your limits. Once you have seen a doctor, got your check up, and made some decisions, then there is one more thing you really MUST DO. Take out Travel Insurance.