Originally Posted by staehpj1

You can and should save weight with multipurpose items, but be careful because it can also be a trap if you go multipurpose just for the sake of doing so. I use many multipurpose items and in many cases they work out well, but don't just assume that a multipurpose item is automatically better.

A few thing to consider when going with multipurpose items:

1. Does the multifunction item actually weigh less than the single purpose items it replaces
2. Does the multifunction item actually do the functions all as well or at least well enough
3. Are all of the functions actually necessary, if not is the item lighter than the single purpose items that it replaces that are actually necessary
4. Are any problems created by the multifunction item? For example do you need it for two different purposes at the same time or will the item be wet or dirty from one use when it is needed for another

If it meets those requirements then go for it; if not you might want to reconsider.

Note that I have not found space to be a big concern for me, but if it is for you the items in the list where weight is considered you may need to consider bulk as well.