Will it fly?
Can you bring Detergent (powder or pellet) on a plane?
Coop checked the book. Here's the ruling for Detergent (powder or pellet):
CARRY-ON
Yes
CHECKED BAG
Yes
What the TSA says
Powder-like substances greater than 12 oz. / 350 mL must be placed in a separate bin for X-ray screening. They may require additional screening and containers may need to be opened. For your convenience, we encourage you to place non-essential powders greater than 12 oz. in checked bags.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.