The "Diagonal Mar Brompton" is designed so that you can hang it on the handlebar of your Brompton bike or on your shoulder when you’re not biking.It has a great capacity. Reinforced to support a lot of weight. In addition to being very wide, it is endowed with reinforcements to hold a lot of weight. It has two inner flaps to protect your personal items. It has an interior compartment to carry your laptop, two interior side pockets and another zipper for your small items. It also has a large front pocket and two outer side compartments. 

Need Chassis base front pouch + support (Brompton) - not included.
You can buy the frame here.

For S/M/H/P Handlebar