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I had the Gap credit card in the past, and I was overall pretty pleased with it. It requires decent credit to open, but you do get 15% off your shopping purchase. If you like to shop at Banana Republic, Piperlime, Athleta and Old Navy, you also earn points per dollar you spend there too. There are $10 rewards gift cards for every 1,000 points you earn. There are special savings for your birthday as well. The interest rate is fairly high so I would recommend using this card with caution and paying it off in full monthly.
As a loyal Gap shopper, I got the Gap Credit Card because the 5 points per dollar spent at Gap and her sister stores was very attractive. During promotions, Gap cardholders often enjoy bigger discounts compared to non-cardholders. I spent over $1,000 in my first year as a cardholder which got me upgraded to Silver status. Holding Silver status, not only do I enjoy free shipping at gap.com that is not subject to a minimum purchase, I also get free shipping from all Gap brick and mortar stores nationwide. The aforementioned benefit makes hunting for a particular item stress free.