I have been using OXO Pop containers for more than 15 years . I love the square shape since I keep all my baking supplies (flour, sugar, etc.) in a drawer. The container that I used for brown sugar developed a crack, so I ordered one of this new model. Within a week, all of my sugar had dried out and hardened (even with a terra cotta sugar keeper in it) and I had to throw it all away. When I filled the container with water, water leaked out around the lid. Warrning: THESE ARE NOT AIRTIGHT LIKE THE OLD DESIGN. They may be good for storing some things, but not brown sugar.