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This is the blue-quality reward listed now on the PTR for low level dungeons done via the new tool.
I haven't been able to get into a group, though, seems to be no low levels testing.
So anyone know what sort of things this bag contains?
Wryxian
Satchel of Helpful Goods
It appears the contents are different depending on the level of the character. From what I can see, it looks like one Rare quality item, possibly with random stats. Seems to be one of every type of wearable item, except weapons and trinkets. There's a chance I'm reading the data wrong, but that's how it appears to me.
Wryxian
Satchel of Helpful Goods
We've got some new information at hand about how these enigmatic satchels work. It seems they don't actually cover every slot but weapons and trinkets, there's a few other slots that aren't covered too -- including chest and pants for instance.

As you've discovered already, these satchels are rewards from doing a random dungeon through the LFG tool at lower levels. There's two groups of items that can be inside them. One includes bracers, rings, necklaces and cloaks. The other has belts, boots, gloves and shoulder items. What you'll find in the satchel is one item from each group, and this is also further influenced by a ten level range. So for example, what is in a satchel received for completing a dungeon between levels 20 and 30 might be a nice necklace and some gloves, but from a dungeon between 50 and 60 you might get a ring and some new boots.

This is done to keep the impact on quest rewards to a minimum, so that at any given time you're only ignoring one or two slots of gear, rather than your entire set. It's also done to mitigate the randomness of the items to some extent; so if you run for example some Scarlet Monastery level dungeons a few times, you'll ultimately end up with that "of the Bandit" or "of the Soldier" piece that you wanted rather than "of the Monkey" or "of Stamina."