Sea to Summit Big River Dry Backpacks

Sea To Summit Big River Dry Backpacks keep your gear dry and easy to carry when on adventures.

Constructed from durable, abrasion-resistant 420D nylon fabric, these backpacks are ideal for rugged activities like kayaking, canoeing, rafting, or motorcycle touring. The comfortable shoulder, sternum, and waist straps keep the pack secure, while the white interior laminate enhances visibility.

Lash loops allow for easy attachment to watercraft, motorcycles, or other equipment, and the hypalon non-wicking roll-top closure ensures water stays out. Designed with an oval base to save space and prevent rolling, the pack also features replaceable Field Repair Buckles, which can be swapped in seconds using a Philips screwdriver.

Scroll down the page for further product details, technical information, sizing, and shipping options

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£124.99

Only 1 left in stock.
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  • Reliably Dry: Waterproof, roll-top closure secured with buckles for a reliable seal and double-stitched, fully taped waterproof seams.
  • Minimalist Carry: Streamlined and adjustable EVA foam pack harness with supportive sternum strap and removable 1.5" / 38mm webbing hipbelt holds pack firmly in place.
  • Built Tough: Heavy-duty 420D Nylon fabric is super-strong, abrasion and puncture-resistant with a triple-coated oval base for increased water-shedding and durability.
  • Grab + Lash: Strong and versatile grab-handle and daisy-chain for confident handling and lashing to kayaks, bikes, motorbikes and roofracks.
  • See Inside: White interior TPU laminate reflects light to provide greater visibility of gear.
  • Brand: Sea To Summit
  • SKU: ASG013031-08, ASG013031-42
  • Material: 420D nylon body
  • Sizes (litres): 50 / 75
  • Dimensions: 50L: 604 x 345 x 285mm / 75L: 675 x 365 x 330mm
  • Weight: 50L - 760g / 75L - 820g
  • Colour: Black, Red
  • Made in: Vietnam

 

We ship worldwide using Royal Mail, UPS & DPD. Please use the tables below as a guide for working out the shipping prices to your address. Please be aware that the product weights stated in the listings are for the products themselves, not the final weight when packaging is included. Our system will automatically calculate this and provide a total order weight during checkout. 

If you are unable to complete the checkout process when coming to choose a shipping option, then your order may be over the shipping weight limit for your address. Please call us on +44 (0)116 2402634 or email us at sales@subzero.co.uk and we can give you a custom shipping quote. 

For more detailed information regarding our shipping process please visit our comprehensive Shipping Page

UNITED KINGDOM

*All UK orders over £50 are shipped free of charge

Order Weight Royal Mail Tracked 24 Royal Mail Tracked 48 Royal Mail Guaranteed Before 1pm DPD Next Day
0.5kg £5.49 £3.99 £9.99 £8.99
1.0kg £6.49 £4.99 £11.99 £8.99
1.5kg £6.49 £4.99 £13.99 £8.99
2.0kg £6.49 £4.99 £13.99 £8.99
10.0kg N/A N/A N/A £8.99

 

* Royal Mail guaranteed service and DPD next day service is not available for Jersey, Guernsey, Isle of Man and Northern Ireland.

USA & CANADA

*All USA & Canada orders over £200 are shipped free of charge

Order Weight DPD 7-14 Days Royal Mail International Tracked
0.25kg £16.99 £9.99
0.5kg £16.99 14.99
0.75kg £16.99 £16.99
1.0kg £16.99 £19.99
1.5kg £16.99 £22.99
2.0kg £16.99 £24.99
4.0kg £24.99 N/A

 

EUROPE

Order Weight DPD 7-14 Days Royal Mail International Tracked UPS 7-14 Days
0.25kg £11.99 £9.99 £49.99
0.5kg £11.99 £12.99 £49.99
0.75kg £11.99 £14.99 £49.99
1.0kg £11.99 £17.99 £49.99
1.5kg £11.99 £19.99 £49.99
2.0kg £11.99 £21.99 £49.99
4.0kg £19.99 N/A £49.99

 

 REST OF WORLD

Order Weight Royal Mail International Tracked
0.25kg £9.99
0.5kg £14.99
0.75kg £16.99
1.0kg £19.99
1.5kg £22.99
2.0kg £24.99
4.0kg N/A

 

If you are unhappy with your purchase, please return it to us within 180 days of receipt. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging.

For more information regarding our returns policy please visit our Returns Page

If you would like to return your order, then you have 180 days from its receipt to do so.

A full refund or exchange is available, provided the items are in their original condition, unworn/unused, and with all tags attached.

Faulty items can be returned free of charge for a refund, repair, or replacement.

To initiate a return, customers should first contact Sub Zero's customer service team on sales@subzero.co.uk with the return details.

The return shipping costs are the customer's responsibility unless the item is faulty or an error has been made with the order

For more detailed information, please refer to Sub Zero's official refund policy.

  • Reliably Dry: Waterproof, roll-top closure secured with buckles for a reliable seal and double-stitched, fully taped waterproof seams.
  • Minimalist Carry: Streamlined and adjustable EVA foam pack harness with supportive sternum strap and removable 1.5" / 38mm webbing hipbelt holds pack firmly in place.
  • Built Tough: Heavy-duty 420D Nylon fabric is super-strong, abrasion and puncture-resistant with a triple-coated oval base for increased water-shedding and durability.
  • Grab + Lash: Strong and versatile grab-handle and daisy-chain for confident handling and lashing to kayaks, bikes, motorbikes and roofracks.
  • See Inside: White interior TPU laminate reflects light to provide greater visibility of gear.
  • Brand: Sea To Summit
  • SKU: ASG013031-08, ASG013031-42
  • Material: 420D nylon body
  • Sizes (litres): 50 / 75
  • Dimensions: 50L: 604 x 345 x 285mm / 75L: 675 x 365 x 330mm
  • Weight: 50L - 760g / 75L - 820g
  • Colour: Black, Red
  • Made in: Vietnam

 

We ship worldwide using Royal Mail, UPS & DPD. Please use the tables below as a guide for working out the shipping prices to your address. Please be aware that the product weights stated in the listings are for the products themselves, not the final weight when packaging is included. Our system will automatically calculate this and provide a total order weight during checkout. 

If you are unable to complete the checkout process when coming to choose a shipping option, then your order may be over the shipping weight limit for your address. Please call us on +44 (0)116 2402634 or email us at sales@subzero.co.uk and we can give you a custom shipping quote. 

For more detailed information regarding our shipping process please visit our comprehensive Shipping Page

UNITED KINGDOM

*All UK orders over £50 are shipped free of charge

Order Weight Royal Mail Tracked 24 Royal Mail Tracked 48 Royal Mail Guaranteed Before 1pm DPD Next Day
0.5kg £5.49 £3.99 £9.99 £8.99
1.0kg £6.49 £4.99 £11.99 £8.99
1.5kg £6.49 £4.99 £13.99 £8.99
2.0kg £6.49 £4.99 £13.99 £8.99
10.0kg N/A N/A N/A £8.99

 

* Royal Mail guaranteed service and DPD next day service is not available for Jersey, Guernsey, Isle of Man and Northern Ireland.

USA & CANADA

*All USA & Canada orders over £200 are shipped free of charge

Order Weight DPD 7-14 Days Royal Mail International Tracked
0.25kg £16.99 £9.99
0.5kg £16.99 14.99
0.75kg £16.99 £16.99
1.0kg £16.99 £19.99
1.5kg £16.99 £22.99
2.0kg £16.99 £24.99
4.0kg £24.99 N/A

 

EUROPE

Order Weight DPD 7-14 Days Royal Mail International Tracked UPS 7-14 Days
0.25kg £11.99 £9.99 £49.99
0.5kg £11.99 £12.99 £49.99
0.75kg £11.99 £14.99 £49.99
1.0kg £11.99 £17.99 £49.99
1.5kg £11.99 £19.99 £49.99
2.0kg £11.99 £21.99 £49.99
4.0kg £19.99 N/A £49.99

 

 REST OF WORLD

Order Weight Royal Mail International Tracked
0.25kg £9.99
0.5kg £14.99
0.75kg £16.99
1.0kg £19.99
1.5kg £22.99
2.0kg £24.99
4.0kg N/A

 

If you are unhappy with your purchase, please return it to us within 180 days of receipt. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging.

For more information regarding our returns policy please visit our Returns Page

If you would like to return your order, then you have 180 days from its receipt to do so.

A full refund or exchange is available, provided the items are in their original condition, unworn/unused, and with all tags attached.

Faulty items can be returned free of charge for a refund, repair, or replacement.

To initiate a return, customers should first contact Sub Zero's customer service team on sales@subzero.co.uk with the return details.

The return shipping costs are the customer's responsibility unless the item is faulty or an error has been made with the order

For more detailed information, please refer to Sub Zero's official refund policy.

Sea To Summit Big River Dry Backpacks keep your gear dry and easy to carry when on adventures.

Constructed from durable, abrasion-resistant 420D nylon fabric, these backpacks are ideal for rugged activities like kayaking, canoeing, rafting, or motorcycle touring. The comfortable shoulder, sternum, and waist straps keep the pack secure, while the white interior laminate enhances visibility.

Lash loops allow for easy attachment to watercraft, motorcycles, or other equipment, and the hypalon non-wicking roll-top closure ensures water stays out. Designed with an oval base to save space and prevent rolling, the pack also features replaceable Field Repair Buckles, which can be swapped in seconds using a Philips screwdriver.

Scroll down the page for further product details, technical information, sizing, and shipping options

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