To give an idea, the main pocket contains a Nalgene liter bottle (24 cm x 9 cm in diameter). And leaves a little room once inside.
The finish is good, the materials used have strong air like big zippers. Made to last.
A good bag to carry a little more than his wallet to carry by hand, with the integrated strap that fits in a slot (it's nice to see that this product has been well thought out and tested!), By passing around the waist or over the shoulder, or grafting onto a backpack thanks to its MOLLE loops (if the backpack also has). Just Alice clip for example staple it.
The bag can also be clipped onto a belt, by passing under two visible clips. In short, it easily can be grafted on various other bags, or even on a bike.
A great "small" handy bag with a large central pocket, easily associated to other media.
Excellent quality / price ratio prohibitive compared to other models that do not do more.