Small containers of butane or other liquefied-gas fuels intended for filling or refilling cigarette and similar lighters — capped at 300 cm³ capacity — occupy a distinct classification from bulk fuel imports, reflecting their consumer-product end use. These articles are regulated as flammable gases under DOT hazmat rules (49 CFR), and air freight is subject to strict IATA Dangerous Goods Regulations quantity limits. Importers should note that the 300 cm³ capacity ceiling is a hard classification boundary; containers exceeding that threshold classify elsewhere as fuel products.

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