Side by side comparison Kitchen Sink, Lunch Box and Big Kitchen. If you need the storage for you drinks (e.g. milk bottles, water) Lunch box is perfect for it. If the space of Kitchen Sink is still not enough for you, Big Kitchen can store all the items you need. I am currently using a Kitchen Sink as my manly baby bag. It holds my children's clothes, milk bottles and potty seat perfect in the bottom compartment. Side by side comparison Kitchen Sink and Big Kitchen. Over all there is barely a size difference between the Kitchen Sink and Big Kitchen. One cool feature of the Big Kitchen and Kitchen Sink is that there are two quick pull tab to unlatch the 2 front hooks. Kitchen Sink dimensions 34L capacity 20" H x 14" W x 8" D Big Kitchen dimensions. 35L capacity 24" H x 17" W x 12" D Side holes. Storage for your shotgun ammo. Side top storage. Front storage. Bottom storage.