Nite Ize 3-Pack

Three stainless steel carabiners with locking gates for under $13 — the utility-per-dollar ratio is hard to beat. Clip one to your keys, one to your bag, and keep a spare. The locking gates prevent accidental opening, and the medium size handles keys, water bottles, and light gear without feeling oversized. Nite Ize has been making this style of carabiner for years, and the reliability is well-established.