Weck Canning Jar Cap, Storage Lid Cap, Silicone, For LARGE Weck Jars, Fits on 3 7/8" (100mm) Diameter, Clear, (2) Free shipping on orders over $50! The Blossom Storage eCap turns large (3 7/8 rim) Weck jars into an airtight and liquid tight container. BPA free. Dishwasher, microwave, and freezer safe. It is also possible to pinch the eCap skirt and pull down while working your way around the jar to achieve the air/water tight seal. Perfect for storing food in bulk in pantries or freezers. Pack easy to transport lunches for an entire week! All eCaps come individually packaged on a stylish card. (Ex. 6 packs have 6 caps attached to 6 separate cards.) This makes them perfect for gifts!