For service calls I use a soft sided brief case type toolbag. All tools store in pockets inside the bag and are well organized. It has seperate pockets for papers & forms, cell phone, pencil holders and room to keep a meter. I also bring a clean door mat to set my tools on instead of the clients floor or counters. Works well for me. I also use the sunblocking window inserts used in vehicles to protect the dash. They fold up for storage and are great for working over sinks. I lay them over the sink so if I drop something it lands on it instead of dropping down the drain. Also don't forget your shoe covers.
You want to show your upmost respect for your clients property. They will appreciate it.

[This message has been edited by A-Line (edited 11-18-2004).]