That’s the one I thought you meant
It can become leaky. I use a special glue to repair waterproof clothes to seal the leaks
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Think of it as extra training
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That’s why I looked up the right name, to avoid confusion 
I went for alternative approach of ‘buy a product for for purpose’, which for me was the ortleib bikepacking bag. Sounds like your experience of that was rather different though!
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I have a waterproof ortleib top tube bag and it’s done the job easily during 12 hours of heavy rain.
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Ortlieb (for me anyway) are the gold standard. I have a frame bag on pretty much all the time and jetwash the bike without even worrying about it 
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I’m in Tucson, and my jacket for 40ish dev weather won’t fit in my jersey pockets
Everything you said makes sense but I’ve gone out a couple times and even my winter cycling jacket isn’t warm enough on top of a base layer and kit so I want to at least be able to wear all of that. The wool socks is a great suggestion too!
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Maybe I misunderstood what you meant by “cold”. I pictured a day where you start around the freezing point and it gets warmer with time to the mid- to high-single digits (in Celsius).
What temperatures are we talking about here?
I have the “smaller” 1.6 l saddle bag and it is great. It easily takes multi tool, pump and a spare inner tube in addition to arm warmers, spare gloves and has room to spare. The 4.1 l model should be large enough to fit a jacket and all.
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Today it’s 44deg F (so single digits C) right now and will be 73 def F (so about 23 deg C) and sunny by the afternoon which is a pretty big swing especially because I hate being cold and the start of any route for me is a few miles downhill which makes the start painfully cold.
Being in the desert this is the normal for a number of months during the year.
It’s getting light early enough here that I’m hoping to get out for an hour or two before the workday starts instead of the trainer most mornings and the problem of the jacket has been enough to prevent me from going out.
Alllnof the advice here has been great and I’ve ordered a rockbros bike backing saddle bag to try (cheap and fast delivery) so I’m excited to try to get out early tomorrow morning!
Cheers!!
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That’s a larger temperature spread than I anticipated. I’d use a saddle bag.
How big is the one you ended up getting? I don’t know about RockBros, the Ortlieb saddle bags are lovely, the quality is top notch.
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Hmm. I’m also in tucson. Most people on the group ride yesterday had arm warmers and vests and gloves. Vests with two way zippers help. First few miles were cold, but then it was fine. I don’t wear a jacket except on my commutes when i know it won’t be warm long enough to care (just unzip the jacket). Only thing i haven’t mastered yet is the climbing-and-descending-lemmon temperature range.
You could plan warmer routes too. If you ride the loop… it’s substantially colder (currently ~40) than, say, midtown surface streets (~45) or the foothills (50+ already) first thing in the morning.
I find breathable stuff has the widest weather range. Splurged for some ornot warmers that breath well and they are great. They seem to have fairly packable jackets too, but i haven’t spent the money yet.
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The Ornot Microclimate jacket is fantastic for those days when it starts out cool and warms up. Highly recommend.
I live in Houston. Our climate is much more humid, but we definitely get those big swings. For those temps, here’s how I dress:
Regular jersey, light foldable jacket (like the Ornot above), wind vest, toe covers and wool socks, leg warmers, full finger gloves, wind blocking headband (to prevent brain freeze at the start). If your hands get hot, you can pack a lighter pair of gloves in your jersey. All of those things are easy to stick in a jersey pocket and you can mix and match as the temps change.
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Step 1: Get rich.
Step 2: Throw layers in the trash as you peel them off.
Step 3: On a long ride where the temps dip down again in the late PM, buy replacement layers.
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Surely that’s what the follow car is for in that situation? 
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I think rockbros is cheaper quality but it was easy and should be good enough to prove the concept, really just trying to get out there and if it works I’ll upgrade to a better quality solution when I use it regularly
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I’ve gone on a couple rides where even the jacket seems cold for me, I bet with time I’ll be less sensitive but to get out I want to be able to get out with the jacket and have a place to store it
Not to high jack the thread but it seems sussed out now.
I’m looking for a light weight pair of good arm warmers. I tossed mine 8 years ago when I moved from SF to Texas. After 8 years I’m finally starting to get cold in the winter here on 40F days. Since winter stuff is on sale now I’m hoping to save a buck.
Thanks
Edit: anyone use Rapha sun screens as warmers?
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I don’t mean to beat a dead horse, but if you’re cold, it’s likely your core is not staying warm. If your core is warm, it will help keep the rest of you warm. Does your jacket have material on the front designed to block wind? If not, have you tried a wind vest? A lot of jackets are not designed to block wind.
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Learned from 24h rides with wild temperature swings: newspaper(s) under vest.
Plus arm and leg warmers, of course.
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I’ve heard the USPS parcels from the post office are free and work well for that too