When I travel and tie, I like to focus on the most used patterns in my box, and the upcoming hatches. In this case it would be the Spring. I too use probably 95% natural materials when tying. Toss in a little bit of flash material for dubbbing, ribbing & whatnot.

Here's what my list would look like:

Dubbing assortments- Hareline Rabbit, Squirrel, Spectrablend, Ice-dub
Hackle- Medium Dun neck, Cree neck, Brown Neck, Grizzly neck
Brahma Hackle- Pale Yellow neck, Natural neck, Silver badger neck, Furnace neck
CDL patches- Dark pardo, Ginger
Hen Pheasant skin
Partridge Skin
Pheasant tail- Dark brown, Natural, Ginger
Peacock Herl
Ostrich Herl- Black & White
Goose Biot- Dark Brown, Ginger, White
Turkey Biot- Olive, Pale olive, Sulphur
V-rib- (small) Olive, clear, brown
Hair patches- Natural elk, bleached elk, coastal deer, Comparadun dark and light Dun, moose body
CDC- Light dun, dark dun, tan, white, natural, olive
Thread- assortment
Uni-wire- (small) assortment
Clear scud back
Holographic tinsel- Gold and silver
Tinsel- (medium) Gold/silver

That's about it. That's actually what ties 90% of my patterns all year. LOL