First, it’s worth noting that sleeping bags come in different sizes and shapes.
Rectangular. This shape offers enough room for rolling over and stretching out. This one is the top choice for summer as it naturally releases body heat.
Mummy. This shape is best during the colder season as it traps the body heat more efficiently, keeping you warm. It also tends to be lighter and less bulky than the rectangular one.
Semi-rectangular. Also referred to as the barrel shape, a semi-rectangular sleeping bag has more width in the shoulders and hips, making it ideal for people with larger bodies. It allows for more movement but is still efficient in trapping body heat.
Double bags. These sleeping bags are designed mainly for couples who want to sleep together.
When it comes to insulation, down is usually better than a synthetic insulator because it’s more lightweight, breathable, durable, and provides more warmth to weight ratio. Meanwhile, synthetic insulators are cheaper, nonallergenic, and dries very quickly, but isn’t as warm as down.
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