Futonkago often have a flatter shape compared to jakago.
Kanji spelling using 布団 (futon) and かご (basket/cage). Less common than the kana form.
Rare kanji spelling using 篭 (cage). The 篭 character is not a standard jōyō kanji and is seldom used.
Compound of 布団 (futon, 'futon mattress') and かご (kago, 'basket' or 'cage'), likely from the resemblance of the flat, mattress-like shape of the gabion to a futon.