Cotswold Aquarius - RS335 System Rucksack

Introducing the first of a new generation of Cotswold Aquarius luggage — where British craftsmanship meets modern modular design.

Big Capability in a Compact Frame
Don’t let the size fool you. The base backpack offers an impressive 33.5L of total storage, spread across its spacious main compartment and four external pockets. Perfect for a finely tuned kit list — and easily expandable for longer sessions.
Expand Your Capacity
Thanks to the Molle Attachment System, this backpack can quickly transform into a multi-day backpack using our bespoke range of ‘System Attachments’ (sold separately).
We’ve built the bag around the official MOLLE (Modular Lightweight Load-carrying Equipment) webbing standard — meaning any MOLLE-compatible gear will attach securely and neatly to the exterior. Between the side and front pockets, you’ll also find custom fittings for our exclusive Brew Tubes — padded, insulated, and easy to access. Perfect for brew kits, stoves, hooks baits, spare spools, bottles, or flasks — anything you need at arm’s reach.
Engineered for Comfort
After extensive testing and customer feedback, we’ve redefined comfort for this size of pack.
Increased padding for long-wear comfort
Refined strap placement for balanced weight distribution
Exclusive tensioning buckle system for instant on-the-go adjustment
Proudly Made in the UK
Every backpack is designed, developed, cut, and assembled in our UK workshop. Built to last, backed by our “Luggage for Life” guarantee, and finished with the signature Cotswold Aquarius attention to detail.
Dimensions
Main Compartment (25L): 35 × 23 × 30 cm
Side Pockets (2.5L each): 17 × 29 × 5 cm
Front Pocket (3.5L): 23 × 29 × 5 cm