Joining slings together...

Just came across a good write up on some unofficial testing done by Black Diamond on breaking strengths when joining two slings directly:

http://www.blackdiamondequipment.com/en-us/journal/climb-qclab/qclab/qc-lab-connecting-two-slings-together/

Bottom line is joining with a carabiner is better because all sling-to-sling joins broke at less than the rated strength of the sling material. Biggest decrease in strength was using skinny material with fatter nylon-- cuts right through the nylon. So keep the sizes about equal, and consider learning a strop bend or climbers hitch.