Andy Thornal Company Custom Waterproof Fly Boxes, from shirt pocket size to boat boxes.  Two sided with clear Lexan© covers make it easy to see your flies.  Construction is very durable.  Positive snap latches let you know that the box is closed, no question.  This box is available is several sizes.

Mid is our best Seller, perfect size for the fishing shirt pocket.

MID - 1½"H x 6"L x 4"W - This is our most popular fly box because it perfectly fits the pockets of most fishing shirts.  Also good in vests, packs, and sling packs.  There are 300 slits in the foam for nymphs and dry flies fo small flies.  But skip every other row, and there is plenty of room for wooly buggers, hoppers, and streamers (about 100ct.)  And there is plenty of room for rubber legged bugs and bonefish flies (about 30.)