There are folding bolt cutters. if you can brace one side of the cutter, and stand on the other, you can generate a lot of force, especially with a bit of a cheater bar.

This lock's list from bikeradar seems comprehensive enough:

https://www.bikeradar.com/gear/catego...&submit=Search

The Fahgettaboudits are up there, not the top ones though.

My first answer isn't always practical. I commute to one place, and leave the lock, a Krypt. N.Y Chain with EV lock, there. I have carried that boat anchor with me occasionally, and the best method is coiling it on the rack and bungeeing it down. I tried around the neck like a bandolier and some other ways, and while they made me feel macho, or stupid, or something, they were uncomfortable, and now the chain is nasty from 3 years of use. Sometimes for errands I take a u-lock instead, and it normally goes in a bag, it won't behave on the rack under bungees.

A key point is that the purpose of locks is not to be stylish. [rant] Good locks are big, ugly, and heavy. Stylish or lightweight locks will sacrifice some of their good locking ability to be so. The TiGr sends up all kinds of warning flags for me... Titanium's useful material qualities do not line up well with what I'd like out of a lock. It has high tensile strength-to-weight ratio, useful for making strong, lightweight bikes, but is _not_ stronger than a similarly _sized_ piece of appropriately treated steel, and it is not harder than good steel. [/rant]

But you asked about how to carry them, with a plea towards less-than-useful clothing. None of my clothing fits a lock either, not my bike gear or my street clothes. I don't like plasticy frame mounts, nor do I like a lock banging around by my headset. If I didn't have the lock-at-work solution, I would probably fabricate a u-lock holster to attach to my rack. I've done some work in leather before, and think I could do something that wasn't horrible, that didn't clank all the time, and that was solidly held in place by gravity and not a clip. I know there are hipsters with PBR holsters, there's probably someone that will sell you an artisanal u-lock holster one for a lot of money.

HvPnyrs's last post was making me snort with laughter at work...

This is all helpful. I probably should have clarified that road vibration has been my main issue with frame mounts--I've lost multiple lights by having them work loose and fly off my bike and the plastic frame mounts that come with many u-locks just seem weak. I was carrying my old u-lock in my backpack, but as the weather gets nice I'm going on more pleasure rides and want to leave the pack at home sometimes!

Stryver, I do work not far from an artisanal hipster bike store (Reload) and their offerings are indeed pretty... But it'd probably be more practical to copy you and keep some monster U-lock at home (for outdoor overnight parking in my backyard) and have some medium security option that I can carry for errands. Work is pretty safe, plus I can leave my bike in the coatroom if I need to (unless it's raining and the coatroom is full of, you know, coats).

A little off topic but I read this in previous posts, my Kryptonite fahgettaboudit U-Lock would also get hard to unshackle (if it gets wet usually, though condensation can do it too), however just spray some graphite on it and it will work like a charm, good as new.

Found this at home depot I believe, and works.

I leave my BIG Abus on the rack at work, and I carry my small-ish Abus in my bag/pannier for shorter stops for groceries etc. Not ideal, but it works.

I used a Kryptonite New York lock for over a year and was quite impressed with it. Unfortunately, I absent-mindedly left it unlocked on the rack as I was leaving work one day, and it was gone when I returned the following day. I replaced it with an On-Guard Bulldog lock because they were on sale at Performance Bike, and I have been disappointed with it. Although it has kept my bike from being stolen, the lock periodically has jammed up, making it impossible to use it. I've had to stash my bike in a storage room on several occasions due to that problem. I was able to free the lock by squirting lubricant inside it, but I don't trust it anymore. The lock is kept locked to covered rack at work, so it is never exposed to rain. I am hoping that Performance will let me exchange it for another Kryptonite NY lock.

The last time I ventured potentially helpful advice on bike locking, I got a critically worded post in reply, saying I was a 'slave to material possessions'. Hey, okay, whatever & too Zen for me - I just want my bike to still be there.

Some suggest not over-thinking locks and insuring the bike against theft away from home. This may or may not be viable for a given individual - I looked into this for my situation and between a lowered deductible that would cover most of the value of a bicycle and a subsequent a rate increase on the entire contents of my house if I made a claim, it didn't make economic 'cents' for me. YMMV

Running random errands is the worst bike security scenario because you're often unsure what the situation will be (folks around, what there is to lock to) until you're there.

You have to balance theft deterrence (and that's all we can hope for: deterrence) with cost, weight, convenience and flexibility. So many of the variables are dependent on an individual's bike & environment that it can be hard to make specific recommendations over the internet. This doesn't stop folks from doing so; in fact, because we've each bet our bicycles that our decision is the right one, discussions can get 'testy'.

It's hard to beat the security and flexibility of a top of the line chain and top quality padlock. This will be your most expensive and heaviest option. It's hard to beat the low cost and light weight of a flex cable + combination lock. This will be the option that provides the least theft deterrence.

Two locks are better than one. Word from the street is that two less secure locks provide more theft deterrence than one more secure lock. Should you spend your lock budget on the one, best lock you can afford or two lesser, but still good locks? Sorry, too many variables to give a universal answer.

At some point, the lock(s) you use becomes less important than your locking method and what you lock to. There are a great many websites that offer advice; read several.

You don't have to outrun the bear. You only have to outrun your buddy.

Similar appearing locks can provide much different deterrence. A excellent example is Abus' 40 and 401 series U-locks. They look identical, but the 401 has better steel, better heat treatment and a better lock mechanism. Tigr's marketing video compares their $200 model with "a U-lock", which looks like one you might buy at a big box store for $15~20. Several posters in the last year had spent their money on Bordo 6000s but seemed to be under the impression that they bought Bordo 6500 level security.

A note about Bike Radar's ratings: they include cost, weight & convenience as well as security. They mark down some of the highest deterrent locks for being heavy and expensive.

With the common availability of battery powered reciprocating saws (aka 'Sawzall'), I gotta give snaps to the thieves still going old school with hacksaws.

When in doubt, I bring these two with me:

Bike Registry used to sell the chain and monobloc:
https://api.ning.com/files/CfRiPhgInw...T/IMG_0133.jpg

Then this one from Amazon:
https://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

Around my area, there are not a lot of bike racks, so I needed something to attach around the poles, benches, etc..

Aw Shuck's, Girrrl, t'were'nt nuthin'.... (pauses while 'Having a Moment', quickly wipes eyes) dam' allergies.

Ahem, Speaking of "Warm and Fuzzies".
Had a "Unscheduled" Mon. 8:00 a.m. "meeting" with my psych/emo health 'Team' (ok, ok, more like a 'miniscule', 'tiny', 'little', relapse/crisis "incall". Thanks, V.A. Outpatient Clinic!, you've always been there for me over the years), Left the "Impromptu Session" with my Psychologist's (plural) assurances that my 'miniscule', 'tiny', 'little', *Retrograde Advance*, of my "ISSUES", will respond *Quite Readily* to twice weekly "Individual Therapy" and 6 day a week "Group Sessions" with "Riders BETRAYED BY CABLE LOCKS", in the months and years going forward.

They have also added a *W.O.N.D.E.R.F.U.L.* new pill to my medication *Regimen*... NO Complaints at all,... UHM except for the size?. this thing is HUGE! I'm talking Horse Pill Here! Did I mention Wonderful?

I'm ONLY "SUPPOSED" to take one before Bed time. But after taking my fist dos last night around 11:00 pm (nomal bedtim), I'm already feelig very much medder...??? er.. Very muh medicat ??? huh????.. Dhayuhm... Thay wernt kiddig whan ttay saaey tooo tak 20 mn defor be dtimm...................... ni ty nit