Sea to Summit Amplitude Down Sleeping Bag Double
The most room and ventilation options of any down bag available; 5 FIdeal for adventures with a base camp, the Sea to Summit Amplitude AmIII Double down sleeping bag brings spacious luxury and incredibly versatile ventilation options to wherever your travels may take you. Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box. High-lofting down and quality construction keeps you cozy when its cold, and the zippers provide temperature regulation up to the point where you remove the upper section and sleep under it as a quilt. The down is responsibly sourced and RDS certified and treated with the environmentally-friendly Ultra-Dry Down treatment.
The most room and ventilation options of any down bag available; 5 FIdeal for adventures with a base camp, the Sea to Summit Amplitude AmIII Double down sleeping bag brings spacious luxury and incredibly versatile ventilation options to wherever your travels may take you. Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box. High-lofting down and quality construction keeps you cozy when its cold, and the zippers provide temperature regulation up to the point where you remove the upper section and sleep under it as a quilt. The down is responsibly sourced and RDS certified and treated with the environmentally-friendly Ultra-Dry Down treatment.
The most room and ventilation options of any down bag available; 5 FIdeal for adventures with a base camp, the Sea to Summit Amplitude AmIII Double down sleeping bag brings spacious luxury and incredibly versatile ventilation options to wherever your travels may take you. Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box. High-lofting down and quality construction keeps you cozy when its cold, and the zippers provide temperature regulation up to the point where you remove the upper section and sleep under it as a quilt. The down is responsibly sourced and RDS certified and treated with the environmentally-friendly Ultra-Dry Down treatment.
The most room and ventilation options of any down bag available; 5 FIdeal for adventures with a base camp, the Sea to Summit Amplitude AmIII Double down sleeping bag brings spacious luxury and incredibly versatile ventilation options to wherever your travels may take you. Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box. High-lofting down and quality construction keeps you cozy when its cold, and the zippers provide temperature regulation up to the point where you remove the upper section and sleep under it as a quilt. The down is responsibly sourced and RDS certified and treated with the environmentally-friendly Ultra-Dry Down treatment.
in 4 offers
The lowest price for Sea to Summit Amplitude Down Sleeping Bag Double right now is $683.76 at Snowys Outdoors, compared across 4 retailers.
The all-time low was $549.00 on 31 May 2024 — today's price is 25% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 3 Nov 2026.
Last updated at 03/11/2026 08:20:00
Amplitude Am3 Double Sleeping Bag (-8 °C)
Sea to Summit Amplitude Down Sleeping Bag AmIII - Clearance Double / Royal / Indigo
Delivery $5
Sea to Summit Amplitude AMIII - Double
Free delivery
Sea to Summit Amplitude Down Sleeping Bag - AmIII Double
Delivery $194.45
| Color | Blue, Red |
| Temperature Rating | -8 ÌŠC (comfort rating), -15 ÌŠC (lower limit), -4 ÌŠC (tested during snow camping) |
| Closure Type | Zipper |
| Size | extra-long |
| Count | Double |
Amplitude Am3 Double Sleeping Bag (-8 °C)
Sea to Summit Amplitude Down Sleeping Bag AmIII - Clearance Double / Royal / Indigo
Delivery $5
Sea to Summit Amplitude AMIII - Double
Free delivery
Sea to Summit Amplitude Down Sleeping Bag - AmIII Double
Delivery $194.45
| Color | Blue, Red |
| Temperature Rating | -8 ÌŠC (comfort rating), -15 ÌŠC (lower limit), -4 ÌŠC (tested during snow camping) |
| Closure Type | Zipper |
| Size | extra-long |
| Count | Double |
