# Ultra-Sil Compression Sack

> Ultra-Sil Compression Sack by Sea to Summit costs $34.95 for Colour: High Rise, Size: 5L at Sea to Summit, the brand's official store, as of October 18, 2026. Returns: 60 days from purchase to request a return; opened or used items are not accepted; excluded: final sale. Checkout happens on the seller's own store; Coreplex adds no fees.

## At a glance

| Field | Value |
| --- | --- |
| Brand | Sea to Summit |
| Sold by | Sea to Summit (the brand's official store) |
| Price | $34.95 for Colour: High Rise, Size: 5L |
| Price checked | October 18, 2026, before tax and shipping. The live page and the seller's store have the current price. |
| Availability | In stock at the seller when checked |
| Condition | new |
| Colour options | Blue Atoll, High Rise, Zinnia |
| Size options | 5L, 8L, 13L, 20L, 35L |
| Rating | 4.9 of 5 from 245 reviews on the seller's store |
| Shopify catalog ID | 3HZtNX3OHybEeZjIuwKr0w |

Buy at Sea to Summit: https://seatosummit.com/products/the-ultra-sil-compression-sack

## Shipping and returns

Returns, refunds and shipping follow Sea to Summit's own policy, not Coreplex's.

In short: 60 days from purchase to request a return; opened or used items are not accepted; excluded: final sale.

| Term | Policy | Exact wording |
| --- | --- | --- |
| Return window | 60 days | "You can return an item for a full refund within 60 days of your purchase date." |
| Window counts from | purchase | "You can return an item for a full refund within 60 days of your purchase date." |
| Item condition | unused, original packaging | "All items must be returned in the original, unused condition and must include all original packaging." |
| Opened items | not accepted | "If you are doing a return and the original card you used to purchase the item is no longer in working order the refund will still post to the account associated with the credit card." |
| Not returnable | final sale | "Final sale items cannot be returned." |
| Refund goes to | original payment method | "Please allow 7-10 days for refunds to process through your original form of payment." |
| Refund timing | 60 days | "You can return an item for a full refund within 60 days of your purchase date." |

Read from the seller's refund policy on 2026-10-18.

- Refund policy: https://checkout.shopify.com/24672501/policies/1317961756.html
- Shipping policy: https://checkout.shopify.com/24672501/policies/25417351341.html

## Other stores selling it

Coreplex counts another listing as the same item only when it shares a Shopify catalog ID or barcode; lookalikes are never priced as equals. Live check: https://coreplex.ai/p/seatosummit.com/the-ultra-sil-compression-sack · MCP: get_passport / compare_prices with product_url https://seatosummit.com/products/the-ultra-sil-compression-sack

## What Sea to Summit says

When you need to compress volume without significantly adding weight, the Ultra-Sil Compression Sack is an excellent solution. Made from a water-resistant, bluesign® approved Ultra-Sil 30D nylon fabric with Non-PFC DWR this compression sack is far tougher than its weight would suggest. Ideal for use inside your pack or travel bag when you need to compress clothing or bulky soft items to allow space for other essentials or fun holiday items. Features Compress soft contents down by as much as two thirds Side-release buckle compression straps for fast and easy access Water-resistant, bluesign® APPROVED Ultra-Sil 30D Nylon fabric with a non-PFC DWR finish Three ultralight compression straps with two ladderlock and one side-release buckles allows easy access and reduces weight Attached flip-top lid prevents straps tangling

## Frequently Asked questions (from the seller's page)

Is this compression sack a good tent storage bag? Perhaps. Carrying the tent canopy in your pack (with the poles under the compression straps) is a great idea. However - the canopy may not compress that much.

## Materials (from the seller's page)

Sack: 100% Nylon; Buckles: 100% POM; Webbing: 100% PP Hydrostatic Head 2000 mm 5L 8L 13L 20L 35L Weight 53 g 1.9 oz 64 g 2.3 oz 82 g 2.9 oz 96 g 3.4 oz 118 g 4.2 oz

## Dimensions (from the seller's page)

15.2 × 15.2 × 29.6 cm 6.0 × 6.0 × 11.7 in 18.1 × 18.1 × 35.5 cm 7.1 × 7.1 × 14.0 in 20.5 × 20.5 × 43.3 cm 8.1 × 8.1 × 17.0 in 24 × 24 × 47.5 cm 9.4 × 9.4 × 18.7 in 28.8 × 28.8 × 57.8 cm 11.3 × 11.3 × 22.8 in Imperial Metric

## Key features (from Shopify's product catalog)

- Compresses soft contents by up to two-thirds for efficient packing
- Water-resistant Ultra Sil 30D nylon fabric with non-PFC DWR finish keeps items dry
- Three ultralight compression straps with two ladderlock and one side-release buckles for easy access and reduced weight
- Attached flip-top or tip-top lid prevents strap tangling and keeps contents secure

| Spec | Value |
| --- | --- |
| Material | Ultra Sil 30D nylon with non-PFC DWR finish |
| Available Sizes | 5 L, 8 L, 13 L, 20 L, 35 L |
| Weight | 53 g (5 L), 64 g (8 L), 82 g (13 L), 96 g (20 L), 118 g (35 L) |
| Dimensions | 29.6 cm |
| Closure | Buckles and flap |

## What Coreplex could not confirm

- Brand confirmation from the brand itself. The brand has not claimed this listing on Coreplex.
- Whether other stores sell this exact item. Coreplex only calls two listings the same item when they share a Shopify catalog ID or a barcode.
- Independent evidence for claims in the listing. Claims are the seller's own.
- A barcode (GTIN) for this listing. Without one, price comparisons with other stores are only possible through Shopify's own catalog grouping.
- Prices for the other options: the price above is for the option shown only.

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Source: Sea to Summit's public Shopify listing, read 2026-10-18. Cite as: Coreplex, "Ultra-Sil Compression Sack", https://coreplex.ai/p/seatosummit.com/the-ultra-sil-compression-sack.html