How 'bout a diaper bag: contents 2 disposable diapers, a tube of oitment, empty bottle of children's tylenol, five wipes in a plastic hinged container (dim's 7"x4"x1"), and a 1 ft x 3 ft changing pad.
daipers are very absorbent, use to soak up blood in case of an accident.
ointment might be of use as improvised grease for a fire piston seal, and may burn (if it contains vasaline or simmilar)
the empty bottle could be used for storing improvised fishing hooks, a small quantity of berries or simmilar foodstuff, especialy if they are intended as seasoning for other foods. could also be broken to provide a small blade, or even can be used as part of a fish trap.
the wipes would be good for cleaning hands, or possibly cleaning knife blades, especialy if they are going to be used to butcher an animal.
the wipe container could, like the bottle, be used to store foraged food (once empty and cleaned out), or other equipment. it could also be used to catch water from smaller rain collecting methods, and used as an improvised drinking vessel.
the pad could be de-constructed, providing several peices of waterproof material. this could be used to collect rainwater, or used as part of an improvised shelter. you could also cut the mateiriel into strips and use it as cordage. the foam inside the mat could be used to collect water in the manner of a sponge, and could also provide an insulated seat, or even a sort of small camping mat.
the bag itself could be taken apart, providing material, which if waterproof can be used the same as the cover of the changing mat. if not waterproof it can be used as improvised cordage, or as part of some kind of windbreak.
the shoulder strap would provide good qualility webbing strap for use as heavy duty cordage, and the D-rings used to attach the strap may be useful as trap parts (simmilar to the way the rings in the izula kit are shown in the instruction sheet), and could also be used as fishing weights, should they have enough strenght.
next item: a 30cm (1 foot) plastic ruler.