Retractable Helmet Sling Outside Where it Should be. Save the storage space and ventilate your helmet. A stretchable sling easily deploys from a zippered lower pocket on the Trekker Line of ski boot bags to securely hold and carry your helmet on the pack’s exterior. BTPTTT More Stories Heated Side Boot Pockets Go Thermal. Dual contoured, insulated and heated side ski boot pockets designed for the most… Pole Grabber™ Smart & Simple. Easy use internal strap system to secure and store poles separately from… Vision Swap™ Changing conditions? Store extra goggles, sunglasses, lenses or you prescription eye glasses.