I prefer the vaseline cotton balls as tinder. Easy to make and carry, catches sparks easily, burns hot and long. Here are my two main fire kits. The keychain is a purple Bison capsule stuffed with several cotton/vaseline balls with a BSA HotSpark and the larger kit is a Swedish firesteel, Maya wood, and an Areka Clic-Clac candy tin with several vaseline cotton balls.

This mint tin is my favorite carry method. The tin is 45 mm diameter and 12 mm high. Push down on the top it clicks open, squeeze the lid "fingers" it clacks shut.