When things go rough enough, panniers can have trouble staying on the bike. The Ortlieb Gravel-Pack is made just for this use, and has a second hook on the lower bar, enabling great stability. The Gravel-Pack works equally well on the front and rear racks, as their size is equal to that of traditional Font-Rollers. - Waterproof: 100% waterproof materials with welded seams - Lightweight, reliable and durable roll closure for great water protection - QL2.1 system with two locking hooks at the top and two open hooks at the bottom - Excellent reflectors front and rear - Made in Germany - 5 year guarantee against flaws in materials and manufacture - Max. cargo 9 kg per bag