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The Bag: Chanel 2.55

What You Might Not Know: People often focus on the bag's quilted leather material, but what was really revolutionary about the 2.55 was the chain strap. Back when Coco Chanel invented it, women used to carry their bags in their hands all the time. What a hassle!

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The Bag: Proenza Schouler PS1

What You Might Not Know: Not only did designers Jack McCollough and Lazaro Hernandez not expect the PS1 to be a runaway hit, they didn't really want it to be—at least, not on the It bag level it is now. After the bag's launch in 2008, Hernandez told Vogue, "this is the anti It bag." So much for that.

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The Bag: Hermès Birkin

What You Might Not Know: Lots of people refer to the bags as coming in two different hardware options: gold and silver. But that's not silver! It's actually palladium, a metal Hermès uses expressly because it never tarnishes. Good thing, considering what an investment one of these bags is.

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The Bag: Anya Hindmarch I'm Not a Plastic Bag Tote

What You Might Not Know: While this picture depicts people lining up to buy the cheeky, eco-friendly tote at a New York Whole Foods in 2007, the bag was massively popular everywhere around the globe. Especially in Taiwan, where the $7.50 tote created a riot (a legitimate riot!) upon its release.

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The Bag: Marc Jacobs Stam

What You Might Not Know: The top closure, called a "kisslock," is probably the most iconic part of the bag, but it's just one of 50 pieces that make up the finished, hand-sewn product.

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The Bag: Fendi Baguette

What You Might Not Know: Released in the late 1990s, the Baguette's  the brainchild of the brand's creative director Karl Lagerfeld.

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The Bag: Louis Vuitton Speedy

What You Might Not Know: It's easy to associate the Speedy with in-your-face logos, but some of the most timeless, elegantly cool women have loved it through the decades, like Audrey Hepburn. She was a huge fan.

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The Bag: Longchamp Le Pliage

What You Might Not Know: If you're not a French speaker, you may not have connected that "pliage" is the French word for fold. (Makes sense, because the most celebrated aspect of the bag is that it folds up, making it beyond ideal for traveling.)

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The Bag: 3.1 Phillip Lim Pashli

What You Might Not Know: Phillip Lim designs bags of all sizes, of course, but even he takes a stance on what the size of your bag says about you. "I like how confident girls are that carry big bags," he says. (Good thing the Pashli is big enough to fit a book and a laptop and a spare pair of shoes.)

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The Bag: Chloé Paddington

What You Might Not Know: In a seriously impressive feat, the Paddington bag sold out before it even reached stores in 2005.

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The Bag: Pierre Hardy Contrast Trim Bags

What You Might Not Know: Pierre Hardy despises the "useless, overweight hardware" that lots of bags use to create a signature look. Instead, the designer plays with contrasting trim to make his bags stand out without being any heavier. (Good news for spines and shoulders everywhere.)

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The Bag: Balenciaga City

What You Might Not Know: Originally, Balenciaga executives didn't like the City bag all that much, and decided not to produce it—crazy, right?—until the designer, Nicolas Ghesquière, pleaded with them to make a few of the City bags as a trial.

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The Bag: Mulberry Bayswater

What You Might Not Know: Mulberry may be all about naming their recent bags after pop culture icons—the Del Rey for Lana Del Rey, the Alexa for Alexa Chung—but the Bayswater has a different genesis. True to the brand's British roots, Bayswater's the name of a West London neighborhood known for leafy streets and Georgian houses.

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