A lightweight kevlar reinforced bag can help keep critters out of your food.  Make sure to check the requirements where you are planning to take this- many require a sturdier solution such as a Bear Vault, especially in areas where bears are active.

The bag itself is not odorproof- STRONGLY reccomend you use a smell proof liner for your items.

Capacity: 5.3G / 20L

Weight: 13.8 ounces / 0.4kg