So you'll need:
- Felt sheet - 30x45 cm x3 mm 550 g/m2 - 11,8x17,7x0,12 inches (mine is from Efco) (I'm not sponsored)
- Four Chinese chopsticks
- Needle and sewing thread (I prefer a contrasting color)
You can choose a different size to better suite your bag. My bag-organizer is perfect for my shopping bag and a little small for most common shoppers (pics at the end) but functional the same.