I purchased the Weekender Convertible and returned it. Like most of Ebags-branded merchandise, it’s overly heavy compared to other brands. A good alternative is the 21 inch Mini rolling duffel, which, while also fairly heavy, seems to have a lot more usable space than the Weekender. However, it doesn’t convert to a backpack, so if you need that feature, probably best to go with the RS rolling backpack.
If you’re looking for a rolling backpack, it’s important to check the weight, depending on your age and physical condition. The wheel assembly adds a lot. I’ve found that even a fairly lightweight rolling backpack can get pretty uncomfortable depending on how long you have to use it as a backpack, though at 62, I’m not in the same shape I was in my forties. They’re great for the occasional rough terrain and staircases, but otherwise, IMHO they’re somewhat overrated.