Weight: Important for backpacking; lighter bags are easier to carry;
Size: Available in different sizes for men, women, and children to ensure a proper fit;
Zipper Features: Look for anti-snag zippers, two-way zippers for ventilation, and draft tubes to prevent heat loss;
Hood: A hood with a drawstring can help retain heat around your head;
Packability: How small the sleeping bag can be compressed for easy transport.