From the product description, check product page for current description, price and availability:

• BEST QUALITY MADE — This backpack is constructed from high quality, water and tear-resistant 30D nylon material. It features YKK zippers sealed with silicone for water resistance. Fine nylon line stitching provides strength. Adjustable, breathable, tear-resistant nylon shoulder straps ensure comfort and durability, making this backpack stand out from other polyester or 210T nylon backpacks on the market.
• WATER RESISTANT — Silicone-coated nylon fabric features PU2000mm water resistance, all zippers sealed by silicone coating can be quickly opened and closed. This lightweight daypack is ideal for outdoor sports or leisure activities in or out of the city.
• LIGHTWEIGHT(4.2oz) and ROOMY(18L) — The main pocket is large enough to carry what you need when you are outdoors or traveling. The outer pocket and inner zippered pocket are great for quick access such as guide books and valuables items. Two large side mesh pockets for water bottles or umbrellas. Size:17” x 10” when unfolded and collapses to 4.7” x 2.7” when folded.
• MOST COMFORTABLE — Padded shoulder straps relieve pressure even with heavy contents, breathable mesh keeps you cool and dry in wet weather and adjustable buckles perfectly fit your back, Blackpongo backpack guarantees you feel the easy and relaxing breeze when wearing it.
• GREAT FOR MANY USES — This packable backpack is for both women and men, GREAT FOR TRAVEL(beach, water sports, rain forest, wet weather countries….. ) OUTDOOR ACTIVITIES( camping hiking cycling mountaineering climbing snow skiing….) DAILY ( gym swimming sports-bag office choice…) & more, ONE BACKPACK for any weather any place.