一次性用品，通常是指一类价廉、不耐用、只使用一次的物品。专门提供便利的一次性用品有：一次性塑料袋、快餐盒、纸杯、卫生筷等等，通常过多地使用这些一次性用品会破坏环境；另外一些是必须的一次性用品，如针筒。而这些都会对环境有一定程度的影响

Disposable is an adjective meaning the ability of something to be disposed of or thrown away after use. Many people now use the term as a noun, i.e. "a disposable" but in reality this is still an adjective as the noun (product, nappy, etc.) is implied. Disposable income is the amount of money left over from one's salary or pay for spending, saving or whatever, after all living costs have been taken out. A disposable (also called disposable product) is a product designed for a single use after which it is recycled or is disposed as solid waste. The term often implies cheapness and short-term convenience rather than medium to long-term durability. The term is also sometimes used for products that may last several months (e.g. disposable air filters) to distinguish from similar products that last indefinitely (e.g. washable air filters). The word "disposables" is not to be confused with the word "consumables" which is widely used in the mechanical world. In welding for example, welding rods, tips, nozzles, gas, etc. are considered to be "consumables" as they only last a certain amount of time before needing to be replaced.