你的想法很自然,但是太现代了,bivy的核心不在于防水透气,就像rain jacket也不一定就要透气一样,早期的bivy都是不透气的尼龙袋子,从REI摘一段:
Bivy Basics
Bivy sack is short for "bivouac sack." It originated as an invention to serve the needs of climbers who wanted lightweight emergency weather protection for sleeping bags during multiple-day ascents, particularly on big walls.
Early bivy sacks were little more than waterproofed nylon slipcovers for sleeping bags--good for keeping sleeping bags shielded from rain, not so good when ventilating vapor produced by body heat.
lz既然有VB,外套就不再需要透气,这是很合理的, 我用的bivy shelter就是不透气料子的廉价货
现在人习惯了“先进”材料,对他的设计本意反而不愿多思考 |