Osprey Straightjacket Compression Sack

The rectangular shape is designed to stack efficiently inside standard luggage and backpacks. Unlike round sacks that leave awkward gaps, this design fits flush against the walls of your pack to maximize internal volume and keep your gear organized.

The sack features flexible nylon wings that wrap around your gear. Once you load your items, you pull the straps to cinch the wings tight, compressing the contents into a stable, compact brick that won't shift during transit.

No, the Straightjacket is made from 40D high-tenacity recycled nylon, which is durable and lightweight but not waterproof. It is designed for organization and compression rather than protecting gear from heavy rain or submersion.

The 12-liter capacity is ideal for compressing soft goods like clothing, a light down jacket, or a mid-layer. It is perfect for separating dirty laundry or keeping a dedicated outfit set organized and accessible within your main bag.

Actually, it makes packing easier. The wide opening allows you to stuff items in without fighting a narrow drawstring, and the compression wings then take over to tighten the load once everything is inside.