I'm working on building a spreadsheet that has a list of all my gear, how much it weighs, and which gear lists each item belongs to so that I can sum up my weight and make gear checklists before trips.

Did anyone build a spreadsheet like this already?

Also, I was thinking it would be cool if this were a web service instead of a spreadsheet. This way you could just plunk in an item (like "warbonnet blackbrird SL 1.7") and it could tell you how many grams it is saving you the time of weighing each item (of course you could weight it to provide your specific item weight).