The altura sonic 15 waterproof pannier single fully waterproof durable panniers engineered to meet the demands of the toughest touring adventures with the klickfixtrade universal rail system and the roll top closure these bags are easy to use and super stable on the bike altura sonic 15 waterproof pannier single features altura shieldtrade technology delivers water and wind protection welded seam construction roll top closure klickfixtrade universal rail fittings