Strollers for two babeies

I have a two year old and a two month old.

I have a double stroller for them but its to big to take everyday and i wat to get a light weight stroller but i wat it convertible so if i don't take my oldest son with me i can put two month old baby in there and and the same with my two year old.

I dont feel safe putting my two month old just in a reaguler stroller yet i would wat something that can change in to a bassinet to a toddler chair that i don't have to pay that much for thank u and can you put pics up please

Sorry for the long story but had to get it out the best way i could thank you again