|A hollow handle on a survival knife might not be the best use of space!|
This leads to another question: What useful items can you actually put in that handle space? Is having that tiny bit of extra space worth weakening the entire knife? After all, the logical place for the knife to fail is where the blade meets the handle, and some hollow handle knives will break under the stress of hard use.
Then, suppose you do pack the handle with assorted items. Will you be able to get them out under the duress of a survival situation, or will the stuff have shifted and settled into a blob of useless junk? A knife handle is hardly the place to store something fragile! Read the discussion!