mattress, 床墊

AP
Soldiers showed the media the mattress Yamato found inside the hut to sleep on
Japanese missing boy Yamato Tanooka found alive in Hokkaido - BBC News
http://www.bbc.com/news/world-asia-36441612

A soldier shows the mattresses that Yamato had been sleeping between while searchers looked for him
Japanese boy Yamato Tanooka lost in Hokkaido forest for six days found alive | Daily Mail Online
Read more: http://www.dailymail.co.uk/news/article-3622997/Japanese-boy-lost-Hokkaido-forest-five-days-alive.html#ixzz4AcnXJXz8
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日本「失蹤」男孩為何能獨自撐過六天？ - BBC 中文网
http://www.bbc.com/zhongwen/trad/world/2016/06/160603_japan_boy_survive