Biker ,
what species do you want this kit for?thats how you should go about making one up, i have the fancy JW Outfitters Top Of The Line bag an it is great,but you can do one better, get a rubbermaid with a locking top, You'll need room for your:
Vice and base or c clamp a pedastal is better you can use a pedastal anywhere an c clamp limits you.
a pouch for your tools that way they are oraganized, this will need slots for two pair of scissors; one for fine work,the other for synthetics,deer or elk hairect, a slot for a whip finisher,slot for some flossers to thread bobbins,slots for two bobbins,slot for a bodkin,slot for hacklepliers or mini clip,an slot for exacto knive
always buy a selection of dubbing in dubbing dispensers or get the bags of all the color you want an get the dispensers separately then label each slot with mailing label cut down
you will need some superfine for dries an some spikey squirrel or hare's ear with antron for nymphs two dispensers will get ya in the door,
de barb pliers
head cement
dubbing wax
maybe these colorsof hackle or capes for dries,light dun,medium dun,grizzly,brown grizzly,barred ginger
center pheasant tails, turkey tails
turkey or goose biots preferably both in brown ,black,olive,white,amber
copper wire for ribbing ultra wire is the best IMHO an comes in multitude of colors as well as gold
Mylar tinsel,it is gold one side silver the other an maybe a few different sizes
CDC lt dun,med dun,brown,tan,ect
a good patch of elk hair for tying elk hair caddis or comparaduns
a good patch od deerhair for tying caddis an comparaduns
micro fibbets lt dun med dun an whatever color yer heart desires
a spirit river pro 20 hook box or two, with sizes of dry fly hooks you use most for the poatterns you like same applies to nymph hooks maybe some streamer hooks.this will get you in the door i think