Capable of being emptied; able to have its contents removed.
From empty + -able (suffix indicating capability), derived from Old English aemtig/emtig, combined with the productive suffix -able from Old French -able (capable of being), from Latin -abilis.
Emptiable is a wonderfully rare word that means something 'can be emptied'—it's technically correct English but so uncommon that most people would just say 'can be emptied.' It shows how English's -able suffix can theoretically attach to almost any verb, creating words that technically exist but nobody actually uses.
Complete word intelligence in one call. Free tier — 50 lookups/day.