Not for climbing, but this multi-purpose stainless steel carabiner is a great way to carry your keys, secure a water bottle to your pack, or hook on some of your EDC. Weighing 0.6 oz / 17 grams, It doubles up as a bottle opener and features a hex driver in the upper corner. Dimensions are approximately 2.6" x 1.18" ( 6.5 x 3 cm ).
Comes with free secured shipping with delivery within 3-4 weeks.
Oh...just in case you're wondering about EDC. It means Everyday Carry (it's catching on).