※ This listing is for one item as indicated in the title. 【Background】 "The Main Backpack for Tent Camping Shifts from 40L to 35L" In recent years, the trend of lighter and more compact mountaineering gear has led to 35-38L backpacks becoming the mainstream choice for tent camping, replacing the 40L class. However, traditional storage sacks designed for 40L, like the Hyperlite Mountain Gear PODS, are often too large and inconvenient to use inside a 35L backpack. Therefore, we developed storage sacks optimized for the inside of 35-38L backpacks. We've created a series of sizes and types to enable efficient packing. 【Features】 ● Fits 35L Backpacks We researched the bottom dimensions of various 35-38L backpacks from brands like Waypoint 35, and based on a length of 26cm and a width of 15cm, we offer S, M, L, and XL sizes with varying heights. They are designed to stack neatly. ● Compatible with Roll-Top When stacking all four sizes inside a Waypoint 35, you can fold the roll-top three times and lock it. This balances storage capacity and packing efficiency. ● Also Compatible with 38L Backpacks Usable even with frameless backpacks like the Zpacks Nero Ultra 38L. You can compress the contents even with an UL Pad wrapped around them, improving the fit. ● R-Processing, Sewing, and Seam Tape Rounded corners for pressure distribution. Sewing + seam tape reinforces the strength reduction caused by needle holes in the DCF fabric, enhancing durability. DCF fabric has a characteristic of reduced strength from needle holes. Seam tape compensates for this, significantly increasing durability. Dyneema tape is very expensive and requires considerable effort, but we believe it is an essential specification for items that are compressed and have force applied to the seams. 【STACK35 Series】 Designed for stackability for 35-38L backpacks. The unified bottom allows S/M/L/XL to fit neatly even when stacked, and it can also be combined with half-size or drawstring stuff sacks. This series is aimed at UL-oriented hikers. 【Specifications】 Size: Approximately 26 x 15 x 16cm Weight: Approximately 34g Material: DCF 1.43oz 【Notes】 ・Decorative items other than the product title are not included. ・Price negotiations are not possible. ・Shipped in simple and compact packaging.