Nite Ize believes no product is too small or basic to be improved. Exhibit A – the classic utility carabiner. Their SlideLock Carabiner is designed with an innovative slide-to-lock feature that securely locks the gate with a simple push and slide movement, and unlocks when you want it to just as easily. Then instead of a bulky tubular construction, they've adopted a cross-sectioned, rectangular stainless steel body that's durable, low profile and slim, allowing it to feed more easily through smaller openings and rest flat in pockets. It comes in four sizes: #6 (to tackle the largest items), #4 (perfect for attaching to a belt loop or backpack to carry larger items), and #3 and #2 (for carrying smaller items like keys, and attaching to zipper pulls).