From Toadwater Guide

Getting

There are 4 differently sized seed bags. The 3 smallest bags can be made using your weaving skill. You can use cloth and yarn to try to produce a seed bag in your inventory -- the odd of success depend on your and your luck!

• 10 "Beggar's Cloth" and 10 "Beggar's Yarn" for "Beggar's Seed Bag" -- its capacity is 10 slots
• 20 "Middling Cloth" and 20 "Middling Yarn" for "Middling Seed Bag" -- its capacity is 20 slots
• 30 "Imperial Cloth" and 30 "Imperial Yarn" for "Imperial Seed Bag" -- its capacity is 30 slots

The second largest seed bag is a "Finnish Seed Bag" and may be bought using Toadkens -- its capacity is 40 slots.

The largest seed bag is an "Obama Seed Bag" and must be weaved using 60 "Obama Yarn", and 60 "Obama Cloth" which are both attainable from the Toadken Store -- its capacity is 60 slots.

Using

In order to activate one, you must place it on the ground and poo 10, 20, 30, 40, or 60 units of poo in it (walk over it to poo in it).

Once you have pooed in the seed bag, you need to pick it up with milking gloves. Then, it will be called "So-and-so's Seed Bag" and you will be able to use it -- each player may only have one seed bag named after the player. Right click on your seed bag while it is in your inventory to open it up to transfer seeds to/from it.

Seeds from trees you cut down, or from walking on wood/seed piles left by workers will automatically go into the your named bag until the bag has no slots left -- this happens even if your named bag is stolen so it is highly recommended that you keep it in your inventory, or personal island -- putting it in a raidable ground hoard or dropping it on the ground are recipes for disaster.

Getting a New Bag

There are very few ways of getting a different, activated/named bag if you have already activated one. It is suggested that you remove all the seeds from your current bag then sell the bag. This effectively destroys your bag since seed bags cannot go on auction. Then you should be able to activate a new bag per the above instructions.