What is the status of items prohibited on animals as burdens when in a courtyard versus a karmelit versus a public domain?

Synopsis

Items prohibited as burdens (masui) on animals are permitted in a courtyard. Their status in a karmelit is disputed. Items prohibited because they look like going to market are prohibited even in a karmelit and even in a merged alley. Items that may fall off are prohibited even in a karmelit according to all views.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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