• Air vents aid reduce the effects of condensation

• When people breathe, they expel quite a lot of drench vapour
• If the outside of the tent is colder than the Backpacking Tents inside (the usual case), then this vapour will condense on the inside of the tent, on any clothing lying about, on the outside of a sleeping bag, etc
• Hence ventilation helps to remove the vapour, although this may let in brumal air.

Dome tents inclination gently in all directions from the peak enabling nearly the entire height to be usable for a large portion of the tent. Tunnel tents have a good usable height along the center line. Frame and cabin tents have gently sloping roofs and near vertical walls. To fully evaluate the usable breadth in a tent, both the maximum wall height and slope must be considered.There are four useful heights used to evaluate appropriate tent height: lie down only, sit, kneel, stand.