For adults, the best deals are those offered in Skåne, Blekinge and Halland in southern Sweden. Holders of these regions' summer tickets can travel unlimited on public transport from the start of June until mid-August, for around 600-850 kronor depending on the region and the date you buy.
Västra Götaland, Uppsala, and Kalmar also offer summer cards for adults, but they are fairly stingy in comparison.
Stockholm, and the nearby regions of Sörmland and Västmanland, also offer summer tickets, but only for those under the age of 19.
Here's the low down on what's on offer:
Stockholm
SL, Stockholm's regional traffic operator, has sent out letters containing a special code to anyone born between 2007 and 2013, which they can use to get the free school holiday ticket on the SL app on their phone or on their existing SL card.
This gives free travel on SL's trains, buses and underground throughout the school summer holidays and all other school holidays throughout the year.
If you've lost your letter or didn't get one at all despite being the right age, you can contact SL customer service for assistance.
Sadly, SL has no special summer offers for those born before 2006.
Gothenburg
Västtrafik, which operates trains, buses and boats in Västra Götaland, the region around Gothenburg, offers a one-month summer card, which gives holders access to all train, bus and ferry traffic in the region and also in Kungsbacka municipality (which is in Halland, despite being a suburb of Gothenburg).
You can buy the ticket between June 15th and July 31st on the Västtrafik To Go app and it costs 860 kronor for adults or 645 kronor for a youth ticket.
Västtrafik says that the ticket gives access to "three zones for the price of one".
Adults with a summer ticket can take three youths (7-19 years old) with them for free.
Skåne
Skåne has arguably the best deal in Sweden.
This year's ticket is valid from June 15th to August 15th, costs 829 kronor, and can be used on trains and buses operated by Skånetrafiken (but not by SJ) all over the region.
If you buy the ticket before July 1st it costs 595 kronor, while anyone buying after that date must pay full price. It can be bought on the Skånetrafiken app, on its website, at a ticket machine at a station, or at one of the company's travel centres. You can either have a paper ticket, have it loaded onto a Skånekort travel card, or have it on the Skånetrafiken app on your phone.
Three people can travel on one summer ticket, but only one of them can be over 20.
The tickets can also be lent out using the app, by simply filling in the telephone number of the person you are lending it to (they need to have the app too). You can lend out your summer card 31 times to a maximum of five people.
What has changed this year is that you can also buy a combined summer card covering both Skåne and Blekinge, giving you unlimited travel across a much larger swathe of southern Sweden.
This ticket costs 1,668 kronor and can only be bought on the Skånetrafiken or Blekingetrafiken apps.
You can also buy a ticket for Skåne and Kronoberg for 1,659 kronor, or a ticket for all three counties for 2,497 kronor. There are discounts all three of those tickets if you buy before July 1st.

Blekinge
Next door Blekinge offers a similar sommarbiljett deal to the one in Skåne. For 839 kronor (595 kronor if you buy before July 1st), you can travel on all Blekingetrafiken trains, buses, and ferries from June 15th to August 15th.
Like Skåne's card, you can buy the ticket on the Blekingetrafiken app, on their website, at a ticket machine, or at a travel centre.
The fun thing about Blekinge's card is that it gives you free travel on the boats that go out to the wonderful Karlskrona, Ronneby, Karlshamn and Sölvesborg archipelagos.
As mentioned above, you can also buy a combined ticket covering Blekinge, Kronoberg and/or Skåne.
Halland
Halland offers a summer ticket for 695 kronor, which can be bought from June 15th, and is valid from June 15th until August 15th.
Like Skåne's card, the tickets can also be lent out to others using the app. The ticket can also be bought as a plastic card, or loaded onto an existing plastic travel card.
The tickets are valid on the Öresundståg, Västtågen, and Krösatågen trains within Halland.
Hallandstrafiken does not offer a combined ticket with other counties.

Kalmar
Region Kalmar, to the north of Blekinge, also offers a sommarbiljett costing 980 kronor for an adult or youth.
Kalmar's ticket allows you to travel on all Kalmar Länstrafik's buses and trains, and also on the Dessi cycle ferry over from Kalmar to the island of Öland. The ticket is also valid on ferries in the Kalmar archipelago.
Uppsala
UL, the travel company in Uppsala, offers a free summer ticket for 7-19 year olds (including if you turn 20 during the summer), valid from from June 1st until August 31st. This follows roughly the same rules as the Stockholm summer holiday ticket mentioned above.
Adults can also buy a summer ticket, costing 2,200 kronor for the same period, reduced to 2,060 kronor for students and pensioners.
They are valid on all buses in the region, on the Upptåget regional trains, and on SL commuter trains between Uppsala, Knivsta and Arlanda. Anyone over the age of 18, however, has to pay if they end their train journey at Arlanda C.
You can buy the ticket on the UL app, on their website, at a ticket machine, or at a travel centre.
Sörmland
Sörmlandstrafiken is offering a summer ticket to those between the ages of seven and 19, as well as students. Costing 630 kronor, it allows free travel on buses only, all around the region. The ticket needs to be loaded onto the gröna resekort, or "green travel card", which young people have for travel in the region.
The tickets went on sale on May 21st, are valid from June 5th until August 21st, and can be bought on the Sörmlandstrafiken website, from a bus driver, or at a Sörmlandstrafiken travel centre.
Västmanland
VL, the regional travel company in Västmanland, offers a summer ticket for seven to 19-year-olds. Like the ticket from Sörmland, it is only valid for buses, and it costs 800 kronor. It is valid from June 1st to August 31st.
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