The ornamental design for the double carabiner, as shown and described.
FIG. 1 shows a front perspective view of a double carabiner;
FIG. 2 shows a front view of the double carabiner of FIG. 1;
FIG. 3 shows a rear view of the double carabiner of FIG. 1;
FIG. 4 shows a right side view of the double carabiner of FIG. 1;
FIG. 5 shows a left side view of the double carabiner of FIG. 1;
FIG. 6 shows a top view of the double carabiner of FIG. 1;
FIG. 7 shows a bottom view of the double carabiner of FIG. 1; and,
FIG. 8 shows an exploded view of the double carabiner of FIG. 1.
The broken lines represent an environment of use and form no part of the claim. The dot-dash-dot lines on a lower edge of the claim depict a boundary of the claim and form no part of the claim. The dot-dash-dot line stretching from the claim to two unclaimed portion represents a direction from where the unclaimed portion was pulled and form no part of the claim.