it is really nice that all of you want to leave your stuff to a charity, BUT have you discussed it with the charity?
If you died tomorrow that might be fine, they might need the donations, but in 5-10 or more years, they might not not even be in existence...
Be sure to talk the foundation and find out just what they will take. Most won't have use for 80% of the items, and they will be trashed in the end....so make sure you really know what they want, in case you need to donate different things to different charities!