For those of you with experience...is it really necessary to carry a sharpening stone with you in the field? I mean if you plan on only going out for a few days. Even if a emergency survival situation should arise a knife isn't going to go dull before you're rescued? I plan to carry a larger knife with which a small stone wouldn't properly sharpen anyways so I think the weight of a larger stone will be a hindrance to my mobility. What do you guys think?