Herschel Supply Co. Trail Barlow Large in Black. Herschel Supply Co. Trail Barlow Large in Black. Canvas exterior with nylon fabric lining. Draw cord top with flap and push clasp closure. Padded adjustable shoulder straps. Side mesh pockets. Adjustable side straps with push clasp closure. Interior laptop slot. Measures approx 10.5 W x 19.5 H x 6.5 D. HERS-UY327. 10271 01174. Herschel supplies backpacks and bags that are modern in shape with loads of crafted detail. Inspired by the old-school American mountaineering heritage and world travel, their collection is a new twist on all your vintage favorites.