You should never keep gas cans anywhere inside your home. Gas is a dangerous substance and a fire hazard and its fumes are perilous for human health. If you insist on keeping a personal stash of gas on hand, store it in an outdoor shed in a durable leak-proof can intended for storage. Storing gas in the garage isn’t great, but it’s better than keeping it in the house. Just be vigilant about safety, storing it out of reach of kids and pets and away from power tools or anything else that could help spark a gas fire.