>>1978462i tried these wire ones. pros: they fold away. cons: too slim to fit bulkier stuff like back packs. Even though their combined volume is equal to a milk crate, i can stuff more into a single compartment milk crate rather than 2 half sized compartments. also the height and location of the milk crate is more accessible in terms of retrieving stuff, and working on the bike, cleaning. lopsidedness of having just one side open as often i just need one side open for a few items. whereas the milk crate is never lopsided and don't have to balance the weight of items over two panniers.