Hey Ryvyan,
I own the Farpoint 40 but am not familiar with the Motherlode Jr. (Though I have several other eBags items so I'm a fan :P)
I recently took the FP 40 with me on a 4 week trip through South Africa and the Middle East.
It held up well through airports (checked and carry on), thrown into buses and cars and through treks in the city.
Depending on how much you pack in it, I think the "heavier duty" straps it has vs. the eBags (just from viewing the pictures on the product page) may be "worth it" depending on the weight you plan to carry. The heavier duty hip straps helped to keep weight distributed, and there are also shoulder tightening straps which I found useful.
I've not used the the Motherlode Jr. so can't speak to it, but have the TLS professonal bags and have found that the straps are slightly lacking (though I recognize they are designed for a different type of travel)
Not sure if this helps
just my 2c.