My daughter is 30lbs and my son is 19lbs and it is very hard to push them. When my daughter is in the back it makes it a little easier. I would only recommed this stroller for young twins.
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for Eddie Bauer Transit Tandem Stroller - Sonoma prices
The Transit Tandem Stroller combines the lightweight and compact fold of an umbrella stroller with the ability to hold two children. The stroller features a large canopy with a covered window, side and rear canopy mesh pockets, netting and a visor. It also easily folds and stores, making it ultra-portable.