I can understand where the auto loot references are coming from, and they are on the right track.
In my experience when it comes to looting various kinds of bags/satchels with goodies inside them, I have been able to 'peek' inside them without actually emptying the contents into my own inventory bags.
It's been a long time since I've used the default UI, but I'm pretty sure regardless if you use the stock UI or any addons, you can close said bag/satchel after looking inside it without actually 'looting' the contents.
But as stated above, you will need to disable the auto loot function to be able to do this.
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