A Cricket Bat made from English Willow in size 4 is typically designed for junior players slightly older than those using size 3 bats, generally in the age range of 9 to 12 years old. Here are the features you might expect for such a bat along with a bag:

1. English Willow: English Willow is a high-quality wood known for its strength, responsiveness, and excellent performance in cricket bats. It offers good power and a nice feel when striking the ball.
2. Size 4: Size 4 bats are slightly larger and heavier compared to size 3 bats, suitable for slightly older junior players. They typically have longer blade lengths and slightly thicker handles to accommodate growing hands and provide better stroke mechanics.
3. Weight: The weight of a size 4 bat is usually a bit heavier than size 3 bats but still lighter compared to adult bats. It’s typically in the range of 2 lb 2 oz to 2 lb 6 oz (964 grams to 1089 grams).
4. Handle: The handle of the bat is designed to provide a comfortable grip for junior players. It may have a slightly thicker diameter compared to size 3 bats to accommodate growing hands.
5. Profile: The bat’s profile is designed to offer a balance between power and control, considering the strength and technique of junior players. It may have a mid to low sweet spot to help young players develop correct batting techniques.
6. Bat Cover/Bag: The bat is likely to come with a protective cover or bag to keep it safe from damage when not in use. This cover also makes it easier for the junior player to carry the bat to and from matches and practice sessions.
7. Quality: While still made from high-quality English Willow, size 4 bats might not be top-of-the-line professional-grade bats. However, they are constructed to offer durability and performance suitable for young players learning the game.
8. Stickers and Branding: The bat may feature branding and stickers from the manufacturer, often reflecting the design and branding of professional cricket bats.

These features collectively ensure that the bat is suitable for junior players in terms of size, weight, and performance while also providing necessary protection and ease of transportation with the included bag.