New answers tagged rope
You could probably tie a sheetbend using the carabiner as one of the "lines". It's easily adjustable and can be doubled for more holding strength. Back when I started climbing in the '70's we used to use a double carabiner brake to rappel (abseil) back down the face. We didn't have descending 8's or any other specialized gear for rappeling, and they still ...
Unless I'm missing something you could just throw the rope over the bar and tie the two ends together with figure eight bend/sheet bend/reef knot. If you're worried about it moving too much you could give it a couple of turns round the bar or even tie directly to the bar with two clove hitches (as Felix suggested) or round turns & two half hitches ...
The clove hitch is probably what you're looking for. You can even tie it directly on the branch/beam/bar without worrying about adding a carabiner. You could also tie it to the carabiner, adjust the length, and clip the carabiner to something else. The clove hitch is one of the most under-utilized climbing knots out there. It's infinitely adjustable because ...
Any 8-10 mm nylon rope will hold many, many times more than your body weight. Climbing ropes are designed to hold dynamic falls, not just static body weight. You could easily get away with 6 mm accessory cord, which is a lot cheaper than a climbing rope. It holds about 700 kg.
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