MOSISO Motorcycle Tail Bag — Expandable 32L–48L Rear Seat Trunk with Waterproof Rain Cover & Quick-Release Straps

MOSISO's Motorcycle Tail Bag is an adjustable 32L–48L rear seat luggage that converts from a compact duffel to a large travel trunk and includes a waterproof rain cover and shoulder strap for versatile transport.

If you need a single carrying solution for daily commutes, weekend trips, or longer motorbike tours, this MOSISO tail bag is built to adapt. Its telescoping length increases usable volume from 32 liters up to 48 liters, while reinforced panels keep the bag stable on the seat. Multiple pockets, reflective trims, and quick-release straps aim to balance convenience, weather protection, and secure mounting.

How does the expandability work and when will I use it?

The bag extends by lengthening its main body from 16.9 inches to 24.4 inches, letting you choose smaller or larger capacity based on load. A hidden pull-out section and internal divider maintain structure when expanded, so items stay organized even at maximum size.

• Compact 32L mode for daily essentials and light commuting.
• Expanded 48L mode for helmet, extra gear, or overnight packing.
• Internal PE frame supports shape whether collapsed or extended.
• Bottom PE panel removes for compact storage between uses.

Will it protect my gear from rain and road grime?

The exterior is polyester fabric combined with sturdy PE panels to resist dirt and splash; a full-coverage waterproof rain cover is included for heavy downpours. The rain cover slips over the entire bag, sealing seams from direct exposure, while zippers and flaps reduce water entry in normal conditions.

• Durable polyester exterior sheds light rain and mud.
• Included waterproof rain cover for full protection in storms.
• Reinforced bottom panel lifts contents off seat moisture and prevents sagging.
• Zipped side pockets and front flap offer extra shielding for small items.

How secure and easy is it to mount on my motorcycle?

Attachment uses four straps with quick-release buckles that lock the bag tightly to a rear seat or rack. Two additional extension straps allow you to lash oversized items to the outside, and reflective strips boost visibility on night rides.

• Four quick-release straps for a stable, no-shift fit on varied seats.
• Two extension straps for fastening bulky gear externally.
• Reflective trim improves rider visibility after dark.
• PE panel structure resists movement across bumpy roads.

Can I carry it off the bike comfortably and organize my belongings?

Yes—MOSISO provides a removable shoulder strap adjustable from 29.5 to 51.2 inches plus side carry handles for hand transport. Inside, a large main compartment holds items like helmets, gloves, and tools, while external zipped pockets and a top elastic band provide quick-access storage.

• Adjustable shoulder strap converts the tail bag into a duffel or satchel.
• Side zippers and front flap pocket keep frequently used items reachable.
• Top elastic band offers extra stowage for jackets, towels, or small tools.
• Side handles make short carries and transfers easier at stops.

Who is this for? Riders who want a single, flexible luggage solution for city commutes, sport rides, and short tours will find this MOSISO tail bag useful. It fits most motorcycle rear seats and suits motorcyclists who need weather resistance, variable capacity, and quick portability without adding a permanent rack. If you travel with a helmet, extra clothing, or tools and prefer one bag that adapts to every trip, this design aims to meet those needs.