These Bike Series packs are designed with bicycles and motorcycles in mind. Heavy duty 840D fabrics are used to handle rough city use. The Bernal and the Van Ness are compatible with Modular Lightweight Load carrying Equipment MOLLE for short. All packs in this series use Boreas' patent pending Super Tramp suspension system, which lifts the weight off your back, allowing air to flow between you and the pack to keep you cool when on the move.Whether you commute on two wheels or just need versatility, the Vernal 35 L Backpack by Boreas has the integrated Super Tramp suspension and a stretch top panel for any shape or size load. A centered front strap uses the full front hidden daisy chains to create compression and gear attachment capabilities.