May 4, 2021 at 10:57 am #3711433
Just picked up a Nunatak Bears Ears 50 pack, which carries a bear canister outside the pack bag, and about 1/3 – 1/2 is in the sun all day. Keeping my food cool and preventing melting or premature spoilage wasn’t a problem when the bear can was inside the pack, but I’m thinking it might be more of an issue with the can outside the pack. I have a clear BV500 and a black Bearikade Blazer will arrive soon.
So I’m considering several options for ways to keep the can contents cool. One is to line the inside with my GG Thinlite CCF pad, but that reduces the volume considerably and I need to be able to carry at least a week’s worth of food. I’ve thought about wrapping the outside with some white sticky shelf liner or similar material, which would add a bit of weight but also some durability against scratching the can. Then I remembered reading recently about invention of a new “ultra white” paint that reflects 98.1% of all sunlight and is being looked at as a way to dramatically reduce the cost of keeping buildings and other structures cool.
Internet search turned up a few things, among them Epoxylite 7001-15 White Single Component Air Dry Insulating Enamel Paint 155°C, white, aerosol SPRAY can (354 g) insulating paint, $20 for a 12 oz spray can.
Thoughts? Other options?May 4, 2021 at 11:06 am #3711434Michael BBPL Member
Why not wrap the outside with CCF or some Reflectix? Minimal weight. It sounds like you might have already been thinking to take a CCF anyway?May 4, 2021 at 11:21 am #3711439
I don’t want to wrap the outside with my CCF because it’s what I put under my Uberlite sleeping mat and I don’t ANY micro anything getting on/in the CCF that might poke the mat. And the CCF is not that durable for picking up and setting down on rocks all day.
But the Reflectix is a great idea. Doh!
Increases the diameter of the canister a bit but well within the limits of the straps on the pack. Practically free and a better sit pad than the CCF for the reasons mentioned.May 4, 2021 at 1:04 pm #3711455Michael BBPL Member
Or wrap the whole can with your CCf and just use a small piece of reflector for the area where the can will be touching the ground when you put your pack down.May 4, 2021 at 1:43 pm #3711457Dustin VBPL Member
Maybe line the inside with space blanket? Or foil, if you need that for any other purpose?May 4, 2021 at 1:50 pm #3711460
Inside the clear BV500 with space blanket makes sense for reflecting radiant sun heat, although I’m not sure it really work as insulation per se. Pretty sure it wouldn’t help inside the black Bearikade, but would on the outside. I’m pretty sure it needs something on the outside so the sun doesn’t hit that black CF.May 4, 2021 at 1:59 pm #3711462Rex SandersBPL Member
Very soon after I bought my Bearikade, I spray painted it white with something not special from the hardware store. I think it helped, but no comparison or hard data. Makes it easier to find, which is good for me, and maybe good for bears, too :-( No problems in that department, but I’m rarely in bear country now.
Some of the paint is chipping off after almost 20 years(!), which gives it character. Might be time for a refresh.
Paint is probably lighter than Reflectix, … but no data.
— RexMay 4, 2021 at 2:02 pm #3711464
It will be interesting to run some tests. I’ll try the other various options before I try paint. I can do the BV500 tests now, and the Bearikade tests when it arrives.May 4, 2021 at 3:02 pm #3711476MarcusBPL Member
When I was researching radiant insulation I decided on SmartFoil
I got the aluminum sheet with no CCF sandwich, but in your case you may consider the 3mm or 5mm CCF version. This would provide both radiant insulation and conduction/convection insulation. They claim to reflect 97% of radiant energy with the 100% Aluminum version (its actually a coarse woven poly fabric similar to walmart tarp material with a coating of reflective aluminum. Its relatively beefy, but not heavy)
If you just want a 2′ x 4′ piece of the aluminum foil-only style sheeting, I have some extra and will send you a couple feet for just the cost of shipping if you want to try it out.
This would have to be on the outside of the container. Inside would not help nearly as much.May 4, 2021 at 3:27 pm #3711483
@mcimes: That would be awesome. I’d love to try it. I only need a piece 16″ x 48″. I’ll test it along with the others. PM sent!
And thanks everybody, many good ideas.May 4, 2021 at 10:55 pm #3711528SIMULACRABPL Member
@simulacraLocale: Puget Sound
Maybe not the most practical these products but..May 5, 2021 at 7:41 am #3711548J RBPL Member
I had a similar problem with my Bearikade inside my 52L cuben pack, it’s a tight fit so the canister is pressed firmly against the pack fabric and I found that the sun was warming my canister through the pack fabric. I found this out because on the trail I like some dark chocolate after dinner and the bars pack well pressed up against the inside wall of the canister, but I would find them melted. I carry some pieces of reflectix to make an insulating cozy for my meals, and I now wedge the reflectix inside my pack between the canister and the fabric — no more melted chocolate bars, and no added weight for me since I was carrying that reflectix anyway.
To save weight you could cut a piece of reflectix that only covers about half the circumference of your canister, you probably don’t need to insulate it all the way around, only the areas facing up and out that will get direct sun exposure.May 8, 2021 at 9:49 am #3711847
One option: 2.3 oz of Reflectix to cover a BV500.
Probably only need about 1/2 of that to eliminate sun exposure, but a full wrap insulates well, makes for a luxurious sit pad, and I can use it under my legs with my short Uberlite air mat.May 8, 2021 at 11:45 am #3711854Ken ThompsonBPL Member
@hereLocale: Right there
A pack large enough to hold the canister would be lightest, easiestMay 8, 2021 at 1:45 pm #3711863jjBPL Member
kilz spray paint would probably work just as well at less than 1/3 the price of the aerosol spray you postedMay 8, 2021 at 3:42 pm #3711869PaulWBPL Member
@peweg8Locale: Western Colorado
If you’re thinking about applying a coating (painting), how about trying a white trash compactor bag first? Not a great deal of insulating ability, but somewhat reflective.May 8, 2021 at 11:16 pm #3711891Denis HazlewoodBPL Member
@redleaderLocale: Northern California
I’ve got an original Garcia, and two sizes of Bearikade. The only thing I carry where heat would matter is cheese, which gets a little ‘melty’, but not a deal breaker. If it’s really a problem I’d go with Reflectix. I use it to keep y water cool, and it works very well. And light as a feather.
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