DRY BAGS: Sea to Summit Ultra-Sil Nano:

Your choice with dry bags can save you quite a few grams. Without them, you could have some sadly wet gear and maybe a disastrous trip. You need to check the seam sealing on the inside of the bags before each trip to ensure they remain waterproof. If you have any doubt, pour a few litres of water into the bag, and see if any can find its way out. If it can, (other than at the opening) I KNOW Sea to Summit WILL replace them. I always use one of their pack liners and have had to swim rivers with my pack a number of times without getting anything inside wet! They have just brought out a new product line (the NANO) which promises 30% weight savings. I have not tried them yet, but I see that the four I currently use (pack liner, 13L, 8L and 1L) would save my 58.5grams! It all adds up. Neither have I tried zpacks’ but all their other products are excellent, and I might save slightly more with theirs (as well as better fitting them in my http://www.zpacks.com/ pack!) Here are some for comparison:

Zpacks: Pack Liner Dry Bag
44 L: weight: 1.9 oz. / 54 grams price: $39.95Dry Bag

2.2 L: weight: .6 oz. / 17 grams price: $16.95
4 L: weight: .7 oz. / 20 grams price: $19.95
5.6 L: weight: .85 oz. / 24 grams price: $22.959.5 L: weight: .95 oz. / 27 grams price: $25.95
12.3 L: weight: 1.1 oz. / 31 grams price: $28.95Roll Top Blast Food Bag
12.3 L : weight: 1.4 oz. / 40 grams price: $29.95

Sea to Summit: Ultra-Sil® Pack Liners

Size	Pack Volume	Oval base x Height	Weight
Small	< 50L	(49 x 16) x 79cm	74g
Medium	< 70L	(51 x 20) x 90cm	98g
Large	< 90L	(55 x 25) x 122cm	126g

Sea to Summit: UltraSil® Dry Sacks

ø11 x 24cm	1L	20g
ø13 x 29cm	2L	23g
ø15 x 33cm	4L	26g
ø17 x 46cm	8L	30g
ø22 x 53cm	13L	40g
ø25 x 61cm	20L	50g
ø30 x 70cm	35L	65g

Sea to Summit Ultra-Sil Nano Waterproof Dry Sack: Sizing and Specifications

Volume	Oval Base x Height (cms)	Weight (gms)
1 Litre	(13 x 7.5) x 24	13 g
2 Litre	(15 x 9.5) x 28.5	16 g
4 Litre	(17 x 11.2) x 33	19 g
8 Litre	(20 x 15) x 47	24 g
13 Litre	(22.5 x 16.5) x 52	27.5 g
20 Litre	(26 x 20) x 63	36 g
35 Litre	(31 x 25) x 70	46 g

EXPED FOLD DRYBAG

Size*	Color	Length x Width	Volume	Weight
XXS	lime	16 x 14 x 7 cm	1 l	12 g
XS	orange	21 x 14 cm	3 l	19 g
S	yellow	30 x 16 cm	5 l	24 g
M	red	35 x 18 cm	8 l	28 g
L	blue	42 x 22 cm	13 l	34 g
XL	emerald green	46 x 25 cm	22 l	41 g
XXL	cyan	52 x 30 cm	40 l	61 g