The Ryobi ONE+ Cordless tire inflator is a great item for the trunk of your car. If you already own a Ryobi tool you’re set, because they sell the inflator without a battery. (You’ll have to purchase a Ryobi 18v One+ battery if you don’t already have one.)

The tire inflator can inflate a tire up to 150 PSI, and can fit into tight places and corners. There’s a pressure gauge and 20-inch cord, too. The inflator has a high 4.4/5 stars on Amazon from nearly 400 reviewers. At $29, it's a great price for a handy tool.