For smaller things (2 ounces) I am really fond of these:
Tube Vault

The site, CountyComm, sells military style supplies.

Here's their description of these 99 cent plus shipping tubes

These Storage Tubes Are Food And Pharmaceutical Grade Crush Resistant (Not Much In Life Is "Crush Proof") Polyethylene Terephthalate (PET). They Come With Air Tight, Liquid Tight Tamper Evident Caps. They Are Also Dishwasher Safe And Made In The USA.

(Container Volume: 50ml or aprox. 2oz)
How Our Staff Members Are Using Them: Some Have Already Liberated For The Following Purposes: Geocaching, Sewing Kits, Detergent For Those Trips To The Laundromat, Flavored Drink Concentrates, Thermometers, Cotton Swabs, Mini Survival Capsule, The Ultimate Match Safe, Spare CR123 Batteries, Emergency Money, Tea, Spices And Sugar. Carry A Double Dose Of Cold Medicine Into the Field Leaving The Big Bottle At Home. The Possible Uses Are Endless.