Why do jeans have that tiny, pointless pocket?

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工場店 No.9608 loose pocket keyring JEANS - レディースファッション>ボトムス>デニム・ジーパン

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The useless design features in modern products

So THAT'S Why There's A Tiny Pocket In Your Jeans

People are only just realizing what the little pockets on jeans is

recycled jeans Archives - You Make It Simple

What is that weird little pocket on your jeans for? - NZ Herald

Reason behind the tiny pockets you can find on pair of jeans - Daily