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Sea to Summit

Sea to Summit Evac Ultralight Compression Dry Bag (20 L)

Premium Confidence: High
  • Waterproof build: 6/10 How well its build keeps water out, from the published seams, closure and submersion claim.
  • Weight for its size: 7/10 How much it adds to your pack for the space it protects.

Lowest price we found

£29.99 at Ultralight Outdoor Gear

In stock. Free delivery. Checked 8 Nov 2026.

RRP £50, checked 19 Oct 2026.

Go to Ultralight Outdoor Gear Compare 2 shops

Squashing a down jacket, quilt or sleeping bag small inside a rucksack while keeping it dry

Capacity
20 L
Weight
110 g
Seams
Taped
Closure
Roll top
Fabric
30 denier

Where to buy

Ultralight Outdoor Gear £29.99 In stock. Free delivery. High Rise colour in stock. Free UK delivery over £15.

View at shop

Sea to Summit £50 In stock. Delivery £4.50. High Rise colour in stock, Atoll Blue sold out. Free delivery over £75.

View at shop

Prices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More

Our ratings (out of 10)

1 to 10, compared with the whole market. Each says what it's based on. How we score

Waterproof build

From maker's figures 6/10

How well its build keeps water out, from the published seams, closure and submersion claim. 6: A bit better than average.

Double-stitched, tape-sealed seams and a hypalon roll-top, with a waterproof, air-permeable base. Sea to Summit says it is for internal use and not for water sports, so there is no submersion claim: the 3 band.

Weight for its size

From maker's figures 7/10

How much it adds to your pack for the space it protects. 7: Better than most.

110 g for 20 L is 5.5 g/L, in the 4.0–5.9 g/L band (Sea to Summit's figure; Ultralight Outdoor Gear lists 103 g, 5.2 g/L, the same band).

In short

Good for

  • Squashing a down jacket, quilt or sleeping bag small inside a rucksack while keeping it dry
  • Light packs where space is tight: 110 g for 20 L
  • Internal use only, not for strapping outside or for water sports

Strengths

  • Four compression straps squeeze soft kit down evenly
  • Waterproof, air-permeable base lets air out without a purge valve
  • 30D Ultra-Sil Cordura body keeps it to 110 g for 20 L (5.5 g/L)
  • Double-stitched, tape-sealed seams
  • Field Repair Buckle you can replace yourself
  • Sizes from 3 to 20 L

Weaknesses

  • Heavier than a plain Ultra-Sil dry bag (58 g at 20 L): about 52 g more for the compression
  • Thin 30D fabric: Sea to Summit says it is not for paddle sports or for carrying outside the pack on a bike
  • Not submersible
  • No hands-on reviews of the current bag at 20 L were found, so durability and ease scores are missing
  • Shops name the base fabric differently (Sea to Summit says Evac fabric, one UK shop says eVent), so older reviews may not match

Sources

We haven't tested this ourselves. Every score comes from these specs, tests and reviews.

ShowHide sources (1)
  1. Sea to Summit UK: Evac Ultra-Light Compression Dry Bag, 20 L size table Specs, 19 Oct 2026. Used for: waterproof build, weight for its size