when you need to find a reliable knife buy a fixed blade bear grylls knife it has a built in fire starter on the sheath and a sharpener on the sheath as well and a whistle. this product may be expensive. but with expense comes quality 5 out of 5.
a whistle is very inexpensive and helps a lot in a survival situation i have mine on a paracord lanyard hanging on my (sb) you can purchase a lanyard in the link below paracordnation.blogspot.com 5 out of 5.
these are fire starters i highly recommend having a fire starter in your survival bag ( sb)
the top image is a coleman fire starter 5 out of 5.
the bottom image is a zippo fire starter yet again 5 out of 5.
paracord is very useful i recommend you having at least one to 2 bracelets made out of 550 paracord which you can get on this link http://paracordnation.blogspot.com/ and also have about 75 to 100 feet of 550 paracord in your survival pack. i also give this item a 5 out of 5 because its very useful.
this useful tool is a no brainier to big wig survival experts i will keep you alive. when you buy a first aid kit make sure you have all the essentials that you may need. i give this a 5 out of 5 because its a very critical thing out in nature.