The head is permanently attached and product goes in and out through bung openings, usually a large and a small one. Common for liquids because the closed top gives a more secure seal, at the cost of being harder to clean and harder to fully empty a viscous product from.
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What packaging is used for viscous products?
Pastes, purees and heavy liquids are decided by how you get them out, not how you get them in.
TermOpen-head drum
A drum with a fully removable lid, closed by a ring and clamp.
TermBung
The threaded opening and plug in the head of a closed container.
TermUN-rated
Packaging tested and marked to a United Nations standard for dangerous goods.
If this becomes a real requirement
CAQUIN sources industrial packaging to specification. Send what you use today, roughly how much, and where it ships — a photo is enough to start.