Stacking Made Easy - Containers click together with a simple 180-degree twist Watertight Seals - Silicone gaskets ensure leak-tight seals Clip It Anywhere - Removable ClipHandle for comfortable carrying or clipping to a bag Safe Snack Storage - FDA food-safe, BPA-free, PC-free, and Phthalate-free No Lost Lids - Lids snap onto container base when in use so you never lose them.