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たぶんハードウェア的な規格はこれと同じ: product detail - 90571

12 oz double wall 18/8 stainless steel thermal tumbler with copper vacuum insulation, stainless steel rim, push-on clear lid, and powder coated finish · gift box included

同梱の紙片:

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12 oz [355 ml] double wall 18/8 stainless steel tumbler with copper vacuum insulation, stainless steel accent, clear push-on lid, and powder coated finish

for hot or cold beverages

12 oz ≒ 354.882 mL なので、だいたい 350 mL と思っておけば間違いない。

蓋のゴムパッキンが取り外せるので洗浄に便利。