S&aring;k Gear BackS&aring;k Waterproof Backpack RUGGED ALL-WEATHER PROTECTION: BackSak is made from heavy duty 500-denier PVC to seal out the elements with watertight, welded seams and a roll-down top. Keeps your gear protected & dry in a variety of outdoor sports and activities. COMFORT & CONVENIENCE: Sternum clip & padded back support help relieve pressure on muscles. Thick, cushioned straps adjust for custom comfort. Handy D-rings at sides hold water bottles & other gear. 2 EASY WAYS TO CLOSE: Simply fold the roll-down the top at least 3 times, then click the top clip to create an instant handle. OR use the side clips & adjust for a snug, compressed fit  its waterproof either way! ZIPPERED, PROTECTIVE POCKETS: Spacious interior pocket keeps electronics & other valuables separate from wet towels & swimsuits. Splash-proof outer pocket safely holds keys, IDs, more. 25 LITERS & 35 LITER SIZES: Both our 25L and 35L sizes feature our sleek, simple design - no tacky slogans or garish logos. Available in a variety of colors and backed by Skog  Kusts 100% satisfaction guarantee. Rain, including heavy downpours Waves &amp; splashes - perfect for kayaking, surfing &amp; sailing Snow &amp; sleet - ideal for skiing, snowboarding &amp; more Sand, dirt, mud &amp; dust - great for camping A padded back &amp; cushioned adjustable straps for comfort Adjustable sternum strap Duraflexbrand clips and hardware Roomy interior zip pocket Splash-proof zippered outer pocket for keys, IDs, etc. 2 secure closure methods: top clip &amp; adjustable side clips D-rings at sides to clip your water bottle or other must-haves