The altura sonic 25 waterproof single pannier 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 25 waterproof single pannier features altura shieldtrade technology delivers water and wind protection welded seam construction roll top closure klickfixtrade universal rail fittings reflective