By completing the “Uncanny Canner” collection achievement you will receive a 20 slot bag. This collection offers one of the quickest and cheapest ways to obtain a 20 slot bag. All you have to do is collect 11 different jars from various Karma Vendors. This guide will show you exactly how it’s done.
Here is a run down of some of the basic collection achievement rewards in Guild Wars 2. The difficulty of completion ranges from easy to moderately time consuming. Uncanny Canner – A basic collection achievement that requires collecting 11 themed jars from vendors around Tyria. Most of the jars can be purchased from the vendors for a small amount of karma. Reward: “Uncanny Jar” 20 Slot Bag