sea to summit sil pack liner/ dry sacks

They leak. Stick with using a trash compactor bag. Cheap, easy, big enough for the whole pack's contents to be kept dry.

It would be neat to make custom sized liners from a mylar space blanket (doable since it can be heat sealed?) or from resizing a compactor bag (can that be done?) or painters drop cloth.

Does anyone know if seam sealing them will make them waterproof?

Look at this link to find a dry bag that works. Better a few grams more than a wet sleeping bag.

http://www.backpackinglight.com/cgi-bin/backpackinglight/xdpy/forum_thread/12717/index.html?skip_to_post=93230#93230

HI Adam,

>are these waterproof or not?

Absolutely not, I recently did a wet trip where I had do a chest high creek crossing and then spent the day walking throug wet srub, my Sea to Summit bag liner had quite a lot of water in it at days end, fortunately I had my sleeping bag and clothes in other water proof bags.

When I got home I filled the Sea to Summit bag liner with water and besides the silnylon itself leaking the seams leaked badly.

Tony

I can't speak for the people who have reported negative experiences, but I have not had these same problems. The Sea to Summit "ultra sil" liners are seam-taped silnylon and I've tested mine extensively both in a controlled environment and in the field, and for the year or so I've had it, it's not leaked. Keep in mind, silnylon has a low hydrostatic head and will seep water if you immerse it very deep, but for use inside a backpack (which has some water repellency anyway), I think it's great.

Since someone refered to custom sized bags: check out uline.com
They specalize in packaging stuff for companies. That's where we buy poly bags, boxes tape and such for our company but you'll also fine a few gems such as ziplock bags with built in bubble wrap in othersizes than BPL current offers as well as a huge variety of poly bags with different tops. These are a bit heavier than residential trash bags but could be purchased to fit exactly whatever pack you have.

ive been swimming with mine and jumped off rock 4 or 5 meters with my pack on into water and at the even of the day my tek towel was slightely damp and it was o=at the top of the bag. so i reckon they're awesome

Jay

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I seam sealed mine and they still leaked.

I had a SS Ultra Sil pack liner (seam sealed) and inside that a Ultra Sil 20L sack (seam sealed). Still leaked at the bottom.