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Thread: Keeping it dry. Containers that work or not

  1. #1

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    Question Keeping it dry. Containers that work or not

    Prompted by this thread http://forums.groundspeak.com/GC/ind...owtopic=195879 i thought id ask what other peoples experience is of containers and keeping them dry.

    Ive never found a dry log in a breath mint container. 35mm film canisters are not waterproof and need good protection and drainage to work. Magnnetic key safes are definitely not waterproof.

    Of course all caches can get wet and if its raining a small container will suffer much more than a large one. (another argument in the UK for the use a large container)

    There again I have also had an ammo box which consistently got wet due to heavy, dew forming foliage.

    Whats other peoples experiences? how do you keep them dry what does not work and does logging under your coat really keep the cache dry !
    "If you can't be a good example, then you'll just have to serve as a horrible warning."

  2. #2
    keehotee Guest

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    Quote Originally Posted by markandlynn View Post
    Of course all caches can get wet and if its raining a small container will suffer much more than a large one. (another argument in the UK for the use of a large container)
    Why's that then? I don't follow your logic..

    Surely severity of water ingress and cache sufferage (?) is going to be dependant on a caches lid seal length, and proportional to the volume of the cache - so a 35mm film canister, with a relatively large volume to seal length ratio, will actually let in a smaller volume of water as a proportion of total cache volume than a larger, flatter, tupperware (not Lock'n'lock) container.........?

    Add to that the fact that rain does not descend as a continuous fall of water - but instead comes down in drops, with an interstitial space between each drop - and it is easy to speculate that a 35mm film canister, having a far smaller opening than a larger container, could conceivably collect far less rain water whilst open for any given amount of time........

    h34r:h34r:
    Last edited by keehotee; 10th June 2008 at 12:12 PM. Reason: just being cocky - mwahahahahaha

  3. #3

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    Found several micro caches in the Lake District at the weekend where the 35 mm film canister was in a slightly larger screw top container.
    Happy Caching

    Gazooks

    - Setting a good example for children takes all the fun out of middle age.

  4. #4

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    I've got a couple of 35mm film canisters out there, and they're certainly not watertight - they need to be in pretty sheltered spots to remain dry inside.

    My own favourites are lock 'n' lock boxes - they have really good seals and provided people close them properly they're absolutely watertight. I do realize that the same could be said of ammo cans, but personally I don't like those, as they're noisy to open and close, and so can be a dead giveaway in quiet spots. They can also be a pain to open sometimes!

    No, I don't think using one's coat or whatever to keep a cache dry is particularly successful - it may (or may not) keep the rain out, but in heavy rain the air's laden with moisture which is going to get shut in the cache when it's closed and then condense.
    ​​Do not go gentle into that good night.
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  5. #5

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    Quote Originally Posted by keehotee View Post
    Why's that then? I don't follow your logic..

    Surely severity of water ingress and cache sufferage (?) is going to be dependant on a caches lid seal length, and proportional to the volume of the cache - so a 35mm film canister, with a relatively large volume to seal length ratio, will actually let in a smaller volume of water as a proportion of total cache volume than a larger, flatter, tupperware (not Lock'n'lock) container.........?

    Add to that the fact that rain does not descend as a continuous fall of water - but instead comes down in drops, with an interstitial space between each drop - and it is easy to speculate that a 35mm film canister, having a far smaller opening than a larger container, could conceivably collect far less rain water whilst open for any given amount of time........

    h34r:h34r:
    The water ingress would surely depend on how many times its opened in the rain.
    "If you can't be a good example, then you'll just have to serve as a horrible warning."

  6. #6

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    To digress slightly from the original topic, I have a nano out there that is anything but watertight. I use waterproof paper for the log strip and on the cache page request finders to sign in pencil as pens are likely to run. generally this works well apart from...

  7. #7

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    Have carried a film pot filled with water for many years in a kit box.
    Never a leak!

    Use the kodak tubs, black tub grey top.
    A lot of the more recent cheapo tubs certainly are not water tight!
    I have a Geocaching problem...
    Work gets in the way!

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  8. #8
    Alan White Guest

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    Quote Originally Posted by markandlynn View Post
    35mm film canisters are not waterproof and need good protection and drainage to work.
    Sorry, I have to - slightly - disagree there. It's true that they're not waterproof (in the sense that they would pass any standard test) but we've used many 35mm containers and not one of them has ever been reported as being wet inside.

    But all 35mm containers are not the same. As Bear and Ragged say, the ones with the grey tops are fine. The lid fits tightly and has a good seal. Then there are the white/clear ones, which are almost sponge-like in their ability to attract and retain water .

    Other micros to avoid are the Groundspeak ones (http://www.expansys.com/p.aspx?i=152615). Despite their high price the rubber seal hardens and breaks very quickly and even when hung with the opening at the bottom the two of them we've used were always very wet inside.

  9. #9
    keehotee Guest

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    Quote Originally Posted by markandlynn View Post
    The water ingress would surely depend on how many times its opened in the rain.
    So you're saying micros are going to be opened more often than regular containers??
    No doubt due to their popularity amongst hardened cachers lol

  10. #10

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    Quote Originally Posted by Bear and Ragged View Post
    Have carried a film pot filled with water for many years in a kit box.
    Never a leak!

    Use the kodak tubs, black tub grey top.
    A lot of the more recent cheapo tubs certainly are not water tight!
    I have never found too much problem with the regular 35mm pots with the snap on lids except they do seem to attract mice/squirrels/? which chew round the edge of the lid causing leaks.

    The oval APS ones and, as others have said, newer 35mm ones, with push in lids would put a sponge to shame

  11. #11
    nobbynobbs Guest

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    A nice medium sized tesco lock-lock ripoff has survived out in the open for several years without any trouble at a couple of my cache sites, they have the advantage that if you are careful you can use the lid as a rain cover while opening and signing the log.

    Mind you some people go to extreme lengths with their cache disguises so the disguise could act as an even better cover

  12. #12

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    Interesting never realised that different 35mm seal better than others. The problem ive had is capilliary action when the lid sits in water. I use acetate sheets or wooden blocks and sharpie pens to overcome this.

    Note this is not an i hate micros thread its a how to keep em dry thread. Ive found lots of damp micros and lots of dry ones as well working out why some stay dry and others dont is surely a good thing ? signing damp log books is never pleasant im sure we will all agree.

    On larger containers ice cream tubs get soaked (and nibbled)

    Some images of the types that work would be good ? also a link to that waterproof paper ?
    "If you can't be a good example, then you'll just have to serve as a horrible warning."

  13. #13

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    Quote Originally Posted by markandlynn View Post
    also a link to that waterproof paper ?
    I use one of these note books and cut it as necessary to make nano strips or fold to fit a micro. One point, do not try to be clever and print on the micro size unless you are very sure your printer ink is waterproof - AFAIK all inkjet ink is not.
    Last edited by Just Roger; 11th June 2008 at 12:34 PM.

  14. #14
    Alan White Guest

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    Quote Originally Posted by Just Roger View Post
    sure your printer ink is waterproof - AFAIK all inkjet ink is not.
    Any printed material we put in a cache is, where possible, laser printed (our laser printer is b&w only). And laminated, unless the container is too small to accommodate the added rigidity.

    We once found a stage of a multi in which were a set of A4 sheets with the instructions for the next stage. The inside of the container was half full of water and the sheets, unlaminated, were soaked and stuck together. Fortunately they'd been laser printed and, after carefully peeling one from the bunch, it was perfectly readable.

  15. #15

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    I've just replaced one of my micros, which was a grey+black 35mm container (but covered in glue and sand then painted brown and black, then stuck to a short bit of tree branch and magnetically attached to a tree trunk). I can confirm that it was wet (I tipped out the water before retiring it). Most similar containers I've come across have been damp to a greater or lesser extent.

    Not a big problem in this case as the waterproof paper inside was holding up well. But I replaced it with one of those containers which are supposed to keep your valuables safe and dry whilst you swim (quite large actually, I can't imagine using it for the proper purpose). 80p from the local shop.

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