thanks for all you advise 
if you have a backpack with straps across it like this:
then you could flip the uni upside down and put the straps around itā¦
might be a bit awkward though.
or you could just ride with one hand and carry your uni with the otherā¦
if you can.
Ive ridden around 13 miles in one day on my 20ā¦ not strait, just riding around with my friend, stopping occasionally at a store or to do tricks. 3 miles is nothing. I used to ride 2.5 miles on a 20 every day to school.
wow! a 28"! i should get one:D 
3 miles isnāt that bad after a few times. my average riding distance to a place just to ride at is 1/2 mile
i ride around there (its a big area) for several hours and ride home
often times iām sure iāve gone 5-6 miles. in one sessionā¦ if you give it a little time and make it have some breaks then you should be good to go. not going to say its going to be easy, unless you do that.
i do it all the time. except it is more like 6-7.
Hi!
3 miles itās okā¦ you can easily cover this distanceā¦ But if you is looking for distance riding a 29ā or a 36ā is the best for you 
I ride about 2,5miles from the park where I Train to my house with my 19āā¦ Isnāt that badā¦ But at the endā¦ I really want to take a shower and eat
If you want a 29ā that isnāt so expensive see this uniā¦ Is on SALE section on unicycle.com:
Nimbus 29ā
Good Luckā¦ and just made a testā¦ try to ride this distanceā¦ Some peoples have better resistance in long riding than others!