Whether for outdoor or urban exploration, the Maxpedition Monsoon Gearslinger which is already a classic, should fit the bill and it is available at the Military 1st online store... "Maxpedition Monsoon Gearslinger is a unique single-shoulder bag that packs serious toughness with tactical style.

Featuring a spacious main compartment, dual hydration options, and quick front access, it's built for urban and outdoor missions alike. Designed for comfort with a wide strap and airflow padding, it's tough enough for all-day wear.

One of the popular sling bags of Maxpedition, the Monsoon Gearlsinger, is now available at Military1st.co.uk... "New at Military 1st is amazing Monsoon Gearslinger from Maxpedition. Especially designed for urban & suburban applications, this unique & durable teardrop shaped shoulder sling pack is a state-of-the-art gear carrier with large main compartment, multiple outer pockets, hydration bladder compartment & wide anti-slip padded shoulder strap.