The carabiner seems like a piece of hardware that will endlessly be experimented with. This Heroclip, by outdoor equipment manufacturer Gear Aid, is a carabiner with a little extra: A swing-out hook, mounted to a pivot point. A rubber foot on the business end of the hook allows it to grip horizontal surfaces.
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It comes in four sizes, with the smallest able to support 40 lbs, the largest, 100 lbs. Prices range from $18 to $28.
Source: core77