飛行機にベーキングパウダー・重曹を持ち込める？（米国TSA・CATSA規則）

条件付き持込可：350ml（12オンス）を超える粉末類は、保安検査場でトレイを分けて個別検査を受ける必要があります。

受託手荷物：預け入れ可能です。大容量の粉末類は受託手荷物に入れると保安検査をスムーズに通過できます。

Limited to what fits inside a single 1-quart (1-liter) transparent resealable bag in carry-on.

Standard toiletries and liquids conforming to the 3-1-1 rule (containers under 3.4 ounces / 100 ml inside a clear quart bag) require no separate declaration. You simply place the bag in a screening bin. Medically necessary liquids exceeding 3.4 ounces must be verbally declared to checkpoint screeners before inspection.

If liquid containers exceeding 3.4 ounces (100 ml) are detected in carry-on baggage without an infant or medical exemption, screeners will not allow them past security. Travelers must surrender the item for destruction, return outside security to place it in checked luggage, or mail it home.

CATSA: Restricted — containers over 350 ml (12 oz) must be screened separately. In checked bags: Yes — allowed in checked baggage with proper packaging.