The Sea To Summit Ultra-Sil Dry Day Pack is a super light and very packable rucksack that is 100% waterproof. It uses the classic roll top dry bag closure ensuring a watertight seal. This 20 litre pack is ideal for light day trips or as a second pack when you're on longer trips and only need a small pack for the occasional day.
The Ultra Sil is made from a lightweight Cordura fabric that has impressive levels of abrasion resistance. All the seams are double stitched for strength and then taped for a waterproof seal. And it also comes with its own stuff sack ensuring it packs down neatly.
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Well this pack has just arrived so I thought I would use it for shopping to try it out for when I go hiking. It carried two two litre bottles of diet cola, one bottle of red wine, a dvd and a kilo of cat food comfortably, there was more room in the pack. I had my event waterproof jacket stored on the back of the rucksack using the cord system. So I am really impressed with the rucksack. The weight of mine in the storage bag is 117grams. I intend on using it for a day pack for when I am hiking (when I have pitched my tent and I'm in need of a day pack)and a stuff sack in the rucksack. So a very light functional rucksack that's folds down to a very small size it is very well thought out.
Refreshingly simple design in a world where the market wants countless features. Claimed weight is a little low- just over 100g is uberlight nonetheless for a waterproof backpack. I nearly did the OMM with it but didn't as the shoulder straps are unpadded and the fabric bunches up when running with a load. I might retrostitch some light padding in the straps and with the addition of a minimalist waist belt you'd have a class beating waterproof mountain marathon pack. It is very good as it is though for shorter outings.
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Amongst the lightest dry bags available, starting at 13g.