Buy Sea Shells 10 Ounce Bulk Bag. This bag of shells have Assorted sizes and shapes but most of the shells are 1 to 2 inches. A variety of different shells that can be used for all sorts of arts and crafts projects! Are you looking for sea shells to buy? Look no further buy seashells online right here. Been selling this bag of shells for over 25 years and its a great all purpose product.