Mesh is a material that is used to make some gym bags to make them look attractive. It is basically a net-like feature.
The dark pink gym bag is a backpack. There is one main compartment, coupled with the beautiful soft pink shade.
The black bag is to be carried in hands only. There is extra space on the front secured by zippers.
The white mesh on the black bag is interesting. You can carry the large bag either in hands or on the shoulder.
The red bag is a statement bag, mainly due to its color. The long strap is black, but the shorter ones are red.