A cloth or leather pouch can hold up to 20 sling bullets or 50 blowgun needles, among other things. A compartmentalized pouch for holding spell components is called a component pouch (described earlier in this section).
RollQuest ships the D&D 2014 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.