I made a staff sack that can be attached to a backpack using Tyvek. ◑ This "External Pack-n-Sack" is designed to hold items like tents and food that you want to access quickly. In my case, I often go camping with my child, so I end up with a lot of snacks, which we call "action food." I also want to take a proper break and eat lunch. Taking things out of the backpack and putting them back in is a hassle. Plus, if I store the snacks inside the backpack, they get crushed, and my child's mood drops. But! With this, both my child's mood and our altitude are soaring! ◑ The size is 15cm (height) x 15cm (depth) x approximately 39cm (width) when unfolded. It weighs 30-32g (there may be slight individual differences). ◑ The key feature is that to minimize rain from entering when attached, the seams are only on the bottom and sides, and a flap is provided inside the drawstring. Also, it's designed so that you can easily pass the buckle through the daisy chain even when the bag is packed full. ※ Wrinkles will occur due to the characteristics of the material (Tyvek sheet). ※ Although the material is waterproof, please note that the product is not completely waterproof due to the sewing. ※ Please note that it will be folded and shipped. ※ Please note that items other than the Tyvek bag are not included. ※ Each item is made with care, but there may be slight individual differences. If you are looking for perfection like a mass-produced product, please refrain from purchasing. Tyvek tyvek Ultralight Mountaineering Yamatomichi atelier Blue bottle Atelier Blue Bottle hyperlite mountain gear Hyperlite Mountain Gear Locus Gear tetonbros ridge mountain gere Montbell Patagonia Jerry Ukai Muraco omm cumulus The North Face Tacoma Fuji NEMO Nruc Staff sack Staff bag coopalex PA'LANTE Jindai Shimountain Works RawLow Mountain Works