mavis78, the large capri is abit smaller than the medium size cabat. In terms of capacity, it should be able to put as many if not more things than your large veneta. It is going to be phased out that's why you see them on sale in the classic colours. As for weight, I thought it would be heavy too but I compared it with a sloane on the other hand and feels to me they dont weigh any different.
The seamless tote is alot smaller and only hand held I believe. I think that's about the same size as the small capri? It all depends what function you want the bag to serve. I bought the capri bag because I want to use it as a diaper bag as well.
I agree with spendalot. the capri is much lighter than i would have expected and would make a good diaper bag (along those lines). i was debating between the capri and the roma for a work bag and the roma is ALOT heavier. i ended up going with the roma though because i like the way it looks. both are great bags though and you get more color choices with the capri.