I would recommend 3 "blades":
- nail clippers
- Leatherman PS4 Squirt
- Spoon or spork (lexan or titanium)
Optional luxuries she might consider adding:
- Narrow pointed splinter tweezers
- Light folding food knife such an Opinel 8, 9 or 10 or a Mora Classic
- Medium grit DMT "credit card" sharpening tool
-
Edited to add: an army style, folding can opener
My thinking...
Long distance trips of this nature tends to drive a person to a lightweight or ultralight approach that's hard to comprehend if you haven't been there/done that.
As Harvey Manning noted, backpacking is really
footpacking. Care for feet, and in particular, care for toe nails is critical. IME, nail clippers are a must have.
The Leatherman PS4 Squirt is a nearly ideal tool for modern backpacking repair work. The pliers can be used to drive a needle through webbing and tough nylon and can be used to deal with most zipper jams and repairs. Little in a modern backpacking kit demands screws or adjustments. One exception is hiking pole straps. The screw driver blades on the PS4 are sufficient or easily cut off with a dremmel if judged to be not needed. The scissors are useful for sewing repairs and 1st aid bandage prep. The knife blade is sufficient for cutting what little cordage is cut (not often, paracord is typically the heaviest she'll deal with) and can be used to open food packages.
90% of backpacking food can be handled with a spoon/spork. Foods that need to be spread can spread with the spoon handle.
This covers the "must haves" of my lightweight kit. Now, for the optional items...
Deep splinters can fester and left untreated, can force you off the trail. SAK or Leatherman Micra style tweezers just aren't enough. For short trips, I am comfortable forgoing tweezers. For a long trip, I would definitely carry them. They are standard part of my "10 essentials" kit.
A food/wood knife isn't needed for modern backpacking. It just isn't. Literally, thousands of people complete the major trails every year with nothing more than a Squirt or Victorinox Classic. Still, some foods are just easier to deal with with a proper knife and if you're going to carry a knife, it might as well be great at food prep. The Opinel 8, 9 and 10 and the classic wood handled Mora Classics (both in stainless) are both insanely tough and light enough to be reasonable luxuries. I have huge XL hands and prefer the Opinel 10 for 3 seasons and I carry a Mora Companion in the winter, when I carry a wood stove. I'll be getting a Mora Classic soon to drop weight.
Outdoor Carry by
Pinnah, on Flickr
Speaking of stoves and fires... She may consider a "multi-fuel" stove capable of burning twigs, such as one of the Caldera Cone variants. I've been using a twig stove (most in the winter) for several years (Emberlit) and generally you don't need to batton wood to feed them and if you do, an Opinel 9 is enough knife for the small wood these stoves are made for. Larger fires on the trail just aren't that common or needed. EDITED TO ADD: I'm not advocating for a wood stove. I think their horribly fiddly and prefer alcohol for a multifuel stove can extend range between alcohol resupplies on long sections of the PCT or AT. Main point to make here is that a diminutive Opinel 9 is sufficient to feed these stoves (I prefer the 10 or a Mora). Nothing more than a Mora is needed.
Both the Opinels and Moras use Sandvick 12C27. IMO, this is the nicest fine carbide steel I've used. I . it over "carbon steel" now. Both companies harden it in the 58Rc range, which seems like the sweet spot. Softer similar stainless (Case SS, or Victorinox Inox) dulls noticeably faster for me.
This steel sharpens easily in the field. I can't imagine a knife that will make the trip without being sharpened. The DMT "credit card" sharpener is my favorite lightweight stone. Some people just pack sections of wet/dry paper but I find that to be less durable and a lot more "fiddly".
edited to add:
Regarding opening cans, 99% of trail food is not canned and increasingly, that which is has easy opening tops. If a can opener is really deemed needed, an army style folding can opener can be tied to the draw cord of the food or stove stuff sack. Weighs a matter of grams, won't get lost and easily jettisoned when deemed extra weight. When, not if.
Hope this helps,