You want only one bag, but you need two - the Scubapro ResortTwin Bag is specially for you.
It can be converted from one to two separate bags, and the twin compartments accommodate wet/dry gear and feature two side pockets
Complete with a shoulder strap and padded handles, the total capacity is 84 litres.
Dimensions: Main bag: 34cm H x 26cm W x 71cm L.
Side bag: 34cm H x 9cm W x 71cm L.
The versatile answer to varying luggage requirements.