Unverified80% confidenceTradeoffTime unknown
留有空气的干袋自带浮力可漂浮，但内部塞满物品后浮力大减；需要防落水漂浮的应预留20%空气空间或选带独立气囊设计的款式
1
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80%
Confidence
Long-term
Relevance
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First Seen
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Unverified带气阀或宽卷口的干袋在装满后会保留空气，落水时能提供额外浮力，可作为应急漂浮辅助，选购水上活动干袋应考虑此特性86% similarUnverified排尽袋内空气后密封可减小体积便于携带，保留空气密封则能提供一定浮力，落水时有助于定位和漂浮84% similarUnverified卷口干袋普遍配有排气单向阀或需手动挤出空气，充气后可作漂浮气囊，落水时能防止装备沉底84% similarUnverified带气嘴的干袋卷口封好后可挤出空气，兼具防水与压缩收纳、落水时残余空气还能提供浮力，适合皮划艇等场景83% similarUnverified卷口干袋封口后应留一定空气形成气囊，落水时可提供浮力防止下沉，但气囊过大会顶起封口，卷3圈后轻压排出多余空气再扣合最佳79% similar
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