Limitations on using Cookies

Make note of the following limitations when using Cookies (I'm not sure if that applies to all Web-technologies or just Asp.Net, but I've just solved a bug related to this issue using Asp.Net):

• A cookie size is limited to 4096 bytes. It is not much, so cookies should be used to store small amounts of data. For larger amounts of data 
  
• Also, number of cookies is limited to 20 per website. If you make new cookie when you already have 20 cookies, browser will delete oldest one.

Quoted from beansoftware.com