Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.If you’re trying to maximize your spending to earn the most rewards possible, online shopping portals can be quite handy. Simply by clicking through one of these sites to make a purchase at your retailer of choice, you can rake in several extra points or miles per dollar. It’s worth taking the extra few seconds to do this even when a portal will only net you an extra mile or two, but it’s especially lucrative when you can take advantage of elevated earning rates.Currently, the United MileagePlus Shopping portal is offering up to 20 miles per dollar when you shop with select brands. This promo is available now through July 16, and the elevated rates are as follows:RetailerElevated RateStandard RateAthleta6 miles per dollar2 miles per dollarBonton10 miles per dollar2 miles per dollareBags20 miles per dollar4 miles per dollarGilt10 miles per dollar2 miles per dollarGilt City20 miles per dollar2 miles per dollarJane5 miles per dollar1 mile per dollarLaneige15 miles per dollar5 miles per dollarL’Occitane15 miles per dollar3 miles per dollarLord & Taylor12 miles per dollar4 miles per dollarSaks Fifth Avenue12 miles per dollar4 miles per dollarSaks Off Fifth12 miles per dollar4 miles per dollarYou’ll get the highest return (20 miles per dollar) when shopping at eBags and Gilt City — a 30% return based on TPG’s latest valuations. Even the retailers with the lowest elevated rates will net you some significant miles, though; 5x miles at Jane.com equates to a 7.5% return on spending.Depending on whether or not this current promo aligns with your shopping needs at the moment, this could be a good opportunity to do some shopping and boost your MileagePlus balance in one fell swoop. Just make sure to make your purchase by clicking through the United shopping portal by Sunday night if you’re interested!Will you be taking advantage of these elevated earning rates?