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In page Pressure cooker:

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Weight is a concern with backpackers, so mountaineering pressure cookers are designed to operate at a lower differential pressure than stove-top units. This enables them to use thinner, and therefore lighter materials. Generally, the goal is to raise the cooking temperature enough to make cooking possible and to conserve fuel by reducing heat lost through boiling.[citation needed] Lightweight pressure cookers as small as 1.5 litres (0.40 US gal) weighing 1.28 kilograms (2.8 lb) are available for mountain climbers. Sherpas often use pressure cookers in base camp.[1]