Just in case you haven't seen it... I wanted to link to Trailpost. I really like their take on backpacking gear organization. You input data about your gear... and it figures out your base-weight and other stats. It separates consumables from other items and lets you sort by different (and customizable) categories. Trailpost is great for people who want to prep for different types of trips because it lets you test different packs that share pieces of gear. I hate inputting each piece multiple times on other sites. I want to easily test out packs for different activities, climates, etc. And, of course, like other sites, you can also print your packing list.
Overall, it's intuitive and easy to use. Check it out.