·Max 45L Large Capacity: ROCKRBOS trunk bag has roomy cushioned interior can hold a lot of stuff, such as bike tools, shoes and extra clothing. Adjustable dividers making it conceivable to carry large cameras. 16L-45L capacity, many options for expansion.

·Versatile & Portable: Expandable double side bike panniers are hided by zippers and available when needed. You can unzip the expansion and fit clothes and shoes in the trunk bag. There are also shoulder and hand straps for carrying the rockbros bike bag with you.

·Sturdy Construction & Durbale: Well made and compact, strong material, good stitching and zippers function smoothly. Hold plenty for daily commuting and a day trip, handy for shopping at the store.

·Easy To Install & Stay In Place: Go straight across or crisscross the solid straps make the bike trunk to fix your bike rack firmly. Suitable trunk bag for mountain bikes, road bikes, leisure bikes, ebikes, etc.

·Compatible with Taillights & Water Bottle Holder: A spot in the rear bike rack bag to attach an tail light and high visibility stripes on the side, increase safety at night. Outside water bottle pocket with a cord to tighten which is helpful over rough roads. Come with a bright and reflective rain cover to throw over the whole bike bag.