I use this technique when traveling and don't have any toys (Fleshlight, etc.). Everything you need for a great orgasm can be found in a hotel room.
First, run the hot water in the sink until it is as hot as it will get-usually too hot to put your hand in it-then soak a hand towel. While the hand towel soaks in the hot water, fold a bath towel lengthwise into thirds and lay it on the counter. Take the plastic bag from the ice bucket or, if there isn't one, use the laundry bag. If you have lube, coat the inside of the bag liberally. If not, empty the bottle of hand lotion from the hotel into the bag.
Carefully take the hand towel out of the sink and wring out the excess water. Fold it in half lengthwise and lay it on the counter. Place the lubed plastic bag on the hand towel and roll it up into a sausage shape, leaving a little of the open end of the bag sticking out. Make sure you don't roll it too tightly or you won't be able to get your cock in. Now roll the sausage up in the bath towel.
Place the 'pussy roll' between the mattress and box spring of the bed or under a seat cushion if there is a chair. Place your laptop on the bed or chair in front of you for online porn, or tune in some porn on the hotel TV and fuck away!
A great way to get off when your on the road!