Can a restaurant ever have too many glasses? From the moment customers are seated at the table, they are given water. With the myriad of enticing beverages available at most establishments following that point, the answer is probably no. If your business is looking for something economical and durable, Update International recommends its 10 oz stackable tumblers. These tumblers are scratch, stain and shatter-resistant, are dishwasher safe and stack inside one another for convenient storage. They come in clear (TBP-10C), red (TBP-10R), amber (TBP-10A) and blue (TBP-10B).