There is no better way to carry luggage on a motorcycle than in a saddle bags, even though carriers provide the maximum space, but packing and loading your luggage in carriers is hard work and they add to the weight of the motorcycle as well.
One of the company providing saddle bags in India is cramster. Even though they charge a premium for their offerings, their products are of good quality.
The stallion (shown below) is meant for Royal Enfield motorcycles and most of the straight exhaust motorcycles and has the following capacity:
• 45~ Liters (14"x12"x8" x2 Sides)
• Plus Additional space for 2x 2000ml + 1x 1000ml Water Bottles
• Plus Pockets for quick access tools
• Plus provision to carry Tripods, tents and Sleeping bags externally

While for most of the modern Indo-Jap motorcycle Colt Saddle Bag is the way to go, with the following capacity:
• 37 Litres (L14"xW8"X (H10"..8") x 2 Sides)
• Plus Pockets for quick access Papers
• Plus Pockets for quick access tools and Water bottle
• Plus provision to carry Tripods, Tents and Sleeping bags
According cramster.co.in Colt can be fitted to:
• Bajaj Pulsar
• Bajaj Avenger
• HeroHonda CBZ
• HeroHonda Karizma
• Honda Unicorn/Shine
• Suzuki Fiero
• Yamaha Enticer
• Kinetic Aquila
• Honda Shadow
• Yamaha TDM850
• Yamaha VMax

For more information regarding Colt Saddle bag click here
For more information regarding Stallion Saddle bag click here