MOSISO Motorcycle Sissy Bar Backrest Bag, 30L Expandable Waterproof Travel Luggage with Rain Cover

The MOSISO Motorcycle Sissy Bar Backrest Bag is a waterproof, expandable 30L travel luggage that fastens to a sissy bar or rear rack and converts to a shoulder bag for versatile motorcycle storage.

Whether you're planning a weekend ride or a longer touring trip, this MOSISO backrest bag is engineered to carry essentials securely on the bike while also functioning off-bike as a shoulder bag or handbag. Built from durable polyester with a rain cover, it balances capacity, weather protection and multiple carry options so you can adapt it to different bikes and travel needs.

How much gear will this sissy bar bag hold?

The main compartment offers 30 liters of storage for clothing, tools, toiletries and snacks; when expanded it increases to 48 liters. An elastic cord on the front gives quick access to items you need fast, while internal organization helps keep small accessories tidy.

• Standard capacity: 30L; expanded capacity: up to 48L
• Fits clothing, small tools, water bottle, toiletries, and electronics
• External elastic cord for towels, gloves or quick-grab items
• Multiple internal pockets for smaller essentials

What weather protection does it provide during rides?

This MOSISO bag uses waterproof polyester fabric to resist rain, mud and dust in everyday conditions. For heavier downpours, a removable waterproof rain cover is included to envelop the bag and keep contents dry.

• Water-resistant polyester shell blocks light moisture and splashes
• Included rain cover offers full protection in heavy rain
• Sealed seams and zip closures reduce water entry
• Quick-dry fabric that’s easy to wipe clean after muddy rides

How does it mount to different motorcycles and how portable is it off the bike?

The MOSISO bag gives two secure mounting options: a sissy bar strap for fast attachment to a backrest and four adjustable straps for fixing to rear racks or frames. Off the motorcycle it converts to a shoulder bag with an adjustable strap and has side handles for hand carry.

• Sissy bar strap for fast attachment to backrest posts
• Four adjustable straps for rear rack or luggage plate mounting
• Detachable shoulder strap (32.7"–53.9" adjustable) for off-bike carry
• Dual side handles for comfortable lifting and loading

Is the size and shape suitable for most motorcycles?

With external dimensions of 18.1 x 12.2 x 12.2 inches, the bag is designed to fit a wide range of cruiser and touring motorcycles. Its compact footprint and flexible straps make it adaptable to different sissy bar heights and rack layouts.

• Overall dimensions: 18.1 x 12.2 x 12.2 inches (L x W x H)
• Low-profile design minimizes wind resistance and keeps load stable
• Expandable body accommodates extra gear when needed
• Compatible with most sissy bars, backrests and rear racks

Who is this for? Riders who want an all-in-one luggage solution for short tours, overnight trips or daily commuting will appreciate the MOSISO Motorcycle Sissy Bar Backrest Bag. It suits motorcyclists who need weather protection, flexible mounting, and the option to carry gear off-bike comfortably—ideal for cruisers, tourers and anyone who wants tidy, secure storage on their ride.