Sea to Summit Lightweight Compression Sack

The Sea to Summit Lightweight Compression Sack is a packable gear organizer built for backpackers and camp travelers who need to reclaim space inside a pack. Made from bluesign-approved, RCS-certified recycled 70D nylon with a non-PFAS DWR finish, each sack compresses soft contents down to as little as one-third of their original volume. Available in 5L, 8L, 13L, and 35L capacities in Spicy Orange, Surf the Web, or Burnt Olive.

Reclaim Space Without Sacrificing Durability

Compressing a sleeping bag, puffy jacket, or fleece layer to one-third its unpacked volume means the difference between a pack that closes cleanly and one that doesn't close at all. The Lightweight Compression Sack achieves that reduction through a set of nylon webbing compression straps that cinch evenly around the cylindrical body, eliminating the bulging that off-axis straps cause. The 5L and 8L each include two ladderlock straps and one side-release buckle strap; the 13L includes two ladderlock straps and two side-release buckle straps for additional control over larger loads.

Recycled Fabric, No PFAS Chemistry

The main body fabric is 100% recycled 70D nylon, bluesign approved and RCS certified, treated with a C0 non-PFAS DWR finish that sheds light moisture without the persistent fluorinated compounds found in older DWR treatments. The inner face carries a PU coating and is finished in bright white, making it easier to spot gear inside the sack in low light. Buckles are 100% POM; webbing is 100% polypropylene.

Details That Speed Up Camp Routines

An attached flip-top lid keeps compression straps from tangling during packing and unpacking, a useful feature when hands are cold or light is fading. A nylon webbing handle on the round base gives a secure grab point when pulling the sack from a pack or stuff sack pile. The sack is water resistant, not waterproof: the seams are not tape-sealed and the opening does not use a roll-top closure, so it is not suitable as a dry bag in rain or water crossings.

Features

• Compression to one-third volume: ultralight nylon webbing straps cinch soft contents down by as much as two-thirds
• Recycled 70D nylon body: bluesign-approved, RCS-certified fabric with non-PFAS DWR finish
• PU-coated interior: waterproof inner coating with bright white finish for easy gear visibility
• Attached flip-top lid: keeps compression straps organized and tangle-free
• Nylon webbing base handle: secure grab point on the round base
• Size-specific strap sets: 5L/8L use two ladderlock plus one side-release strap; 13L uses two ladderlock plus two side-release straps

Specifications

Who This Is For and Isn't

The Sea to Summit Lightweight Compression Sack suits backpackers, overlanders, and car campers who need to compress sleeping bags, insulating layers, or other compressible soft goods to free up pack volume. The 5L and 8L are well matched to down or synthetic puffy layers; the 13L and 35L handle larger sleeping bags or bulkier gear.

This sack is not a dry bag: the seams are not tape-sealed and the opening does not roll-top seal, so it does not protect contents from sustained rain or water immersion. It is not designed for rigid or sharp-edged items. Tent poles stored inside may prevent full compression of a tent canopy.

Common Questions

Is the Lightweight Compression Sack waterproof?

The Sea to Summit Lightweight Compression Sack is water resistant, not waterproof. The seams are not tape-sealed and the opening does not use a roll-top closure, so water can enter if the sack is exposed to sustained rain or submerged. For full waterproofing, a dedicated dry bag is the better choice.

Can the Lightweight Compression Sack be used to store a tent?

Carrying a tent canopy inside the Lightweight Compression Sack is possible, and stowing poles separately under the compression straps works well. However, tent canopy fabric does not compress as readily as down or synthetic insulation, so the full two-thirds volume reduction may not be achievable with a tent canopy inside.

What is the Lightweight Compression Sack made from?

The main body of the Sea to Summit Lightweight Compression Sack is 100% recycled 70D nylon, bluesign approved and RCS certified, with a C0 non-PFAS DWR finish on the outer face and a PU coating on the inner face. Buckles are 100% POM and webbing is 100% polypropylene.