Sea to Summit Ultra-Sil Dry Sack

Sea to Summit Ultra-Sil Dry Sacks are great for internal organisation of larger bags for bikepacking, adventures and travel.

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Weight: 20 - 26 g   Capacity: 1.0 - 4.0 L

$17.99 - $22.99

Sea to Summit Ultra-Sil Dry Sack

Sea to Summit Ultra-Sil Dry Sacks are great for internal organisation of larger bags for bikepacking, adventures and travel. Made with lightweight, waterproof 30D Ultra-Sil fabric featuring CORDURA® yarns, it's the perfect choice to organize your gear inside your backpack or duffle like a pro. The semi-translucent fabric makes it’s easy to see what’s in each dry bag. Other features include a non-wicking hypalon roll-top closure, a round base for ease of packing and taped seams to keep moisture out. 

ROBO-KIWI recommends these lightweight dry bags for internal organisation of the larger bags and as an extra layer of water protection.

  • 30D siliconized high-tenacity CORDURA® Nylon fabric for extra strength, durability and a smooth finish for easy packing
  • Waterproof, reinforced seams - double stitched and tape sealed
  • Waterproof hypalon roll-top closure does not wick moisture
  • Reinforced stitching for greater seam strength on all stress points
  • Avoid sharp or hard-edged objects and abrasive surfaces
  • Super compact and ultra-lightweight
  • This product is not intended for boating or marine use
  • Features a 15mm field-repairable buckle with stainless steel pins

Please note that these dry sacks are made by Sea to Summit and are imported (not made in NZ).

Which dry bag is right for me?

This depends a lot on what you intend to use the dry bag for. The Sea to Summit Big River Dry Bag is well suited as an all round versatile dry bag for particularly wet conditions, overland expeditions or when your adventure includes water/paddle sports. It will fit comfortably in our ROBO-KIWI harnesses, but is shorter, wider and heavier for its volume compared with ROBO-KIWI dry bags. For the best bikepacking-specific dry bag, we recommend using ROBO-KIWI double-ended dry bags as they have been specifically designed for fitting on bike handlebars.

→ See all Handlebar Bags
→ See all Bikepacking Dry Bags

For internal organisation and modular packing inside your front bag or saddle bag, we recommend using Sea to Summit Ultra-Sil Compression Sacks and Sea to Summit Ultra-Sil Dry Sacks.

For temporary extra storage on longer multi-day rides, brevets or bikepacking races where you need to periodically resupply or a lightweight summit day, we recommend the extremely compact and ultralight Sea to Summit Ultra-Sil Nano Day Pack.


Yes, in situations where the dry bag will not be submerged.

Product Code:STS_DS
Weight:20 - 26 g
Capacity:1.0 - 4.0 L
Height:24 - 33 cm
Width:11 - 15 cm
Depth:11 - 15 cm

Size Guide

1 litre: a phone in a waterproof case (double bagging essential), snacks & wallet
2 litre: some snacks, first-aid essentials, gloves or beanie
4 litre: shell / down jacket or gloves / beanie, day trip essentials