Sealock Foldable Waterproof Hiking Daypack

A packable daypack is an ultralight backpack that can fit in your luggage (or even your pocket). They usually compress into a small pouch. They come in a range of sizes, some tiny and ultralight with one compartment, others bulkier with many of the pockets and features you’d expect in a regular backpack. They are also sometimes called a foldable backpack or collapsible backpack. Sealock provide you the High Quality Foldable Waterproof Hiking Daypack

Sternum strap – A chest strap for extra support and to keep the bag from moving around. Waterproof Light Weight Travel Camping Backpack aren’t common on packable daypacks, but they have become a must-have for us as they make a big difference to comfort. The Matador Freefly16 is the lightest daypack on this list with a sternum strap. All the bags in the Full Featured section also have them. Back and shoulder strap padding – Most don’t have back padding and only light shoulder padding. For heavier loads you might need more.
Laptop compartment – Outdoor Soft Foldable Bag will add significantly to the weight, but it’s a good idea if you’ll be carrying around a laptop often as most don’t offer any protection. The Tortuga Out breaker is best for laptops.
Hydration port – If you prefer drinking from a water bladder, look for this. They aren’t common in ultralight bags but the REI Flash Pack and Matador Beast18 do have them. 

Weather resistance – Most daypacks aren’t waterproof but look for ones that are water resistant. The Packable Hiking Daypack is a fully waterproof daypack.