Ever noticed the diamond-shaped patch that's commonly on backpacks?
The feature is called a lash tab – and it actually has a little-known use.
They allow you to hang extra items from the bag if you’ve run out of room inside them.
It’s also handy if you want to get hold of something quickly instead of rifling through your entire rucksack.
The lash tab tends to be used for holding water bottles nowadays, but it used to have a very different purpose.
Jamie Cormack, co-founder of Herschel, said the patch was important for those trekking in the snowy mountains.
He told TODAY : "Originally, it was designed to carry an ice axe.”
When backpacks became more mainstream, designers decided to keep the lash tab to remember the origins of the trend.
Jamie added: “(They’re) a nod to the past, to pay homage to those old alpine bags that had these."
We must admit, our minds have been blown a little.
The same thing happened last month when we found out why there’s a small button on jeans.
The small buttons are actually called rivets – and they date back to 1872.
Their existence are all because of Nevada-based tailor Jacob Davis and Levi Strauss & Co.
Davis had been buying fabric from the company to create clothing for miners.
He wrote a letter to Strauss saying how the rivets helped to strengthen the pockets when the miners were filling them with tools.
The idea stuck, with Levi’s and Davis patenting the "improvement in fastening pocket openings".
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