Reddit mentions of Rainleaf Microfiber Towel,Army Green,24 X 48 Inches

How much luggage does he travel with and how many countries is he going to? That will determine what’s a good choice.

My fave travel gadgets have been

1. battery charger, a large one that can go multiple days without charging. And also your friends will like to use.
   
   https://www.amazon.com/gp/aw/d/B00X5RV14Y/ref=mp_s_a_1_3?ie=UTF8&qid=1511981716&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=20000+mah+portable+charger&dpPl=1&dpID=31MnmAEjDaL&ref=plSrch
   
   
2. micro towel. (It’s a game changer) I got the one at rei in a large. Just big enough to wrap around your waist.
   
   https://www.amazon.com/gp/aw/d/B01K1TX77W/ref=mp_s_a_1_7?ie=UTF8&qid=1511981752&sr=8-7&pi=AC_SX236_SY340_QL65&keywords=travel+towel&dpPl=1&dpID=416HcYQQ56L&ref=plSrch
   
   
3. cabeau travel pillow, eye mask, ear plugs (if he’s flying a lot or going to a lot of places. This is my sleep anywhere kit and essential if traveling multiple countries)
   
   https://www.amazon.com/gp/aw/d/B004ZIDXK2/ref=mp_s_a_1_3?ie=UTF8&qid=1511981907&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=cabeau+evolution+pillow&dpPl=1&dpID=41RvkBLi8jL&ref=plSrch
   
   https://www.amazon.com/gp/aw/d/B00GSO1D9O/ref=mp_s_a_1_3_a_it?ie=UTF8&qid=1511981971&sr=8-3&keywords=eye+mask&dpPl=1&dpID=41NEugUfp7L&ref=plSrch
   
   https://www.amazon.com/gp/aw/d/B00XW0P84I/ref=mp_s_a_1_11_a_it?ie=UTF8&qid=1511982013&sr=8-11&keywords=ear+plugs
   
   
   
4. collapsable water bottle(spending money on bottled water adds up and you can get water after you pass through security for the plane when the air gets dry. I get dry throat on planes)
   
   https://www.amazon.com/gp/aw/d/B015RZTPJY/ref=mp_s_a_1_8?ie=UTF8&qid=1511982056&sr=8-8&pi=AC_SX236_SY340_QL65&keywords=collapsible+water+bottle&dpPl=1&dpID=41lBy7By8XL&ref=plSrch
   
   
5. a collapsable travel day back pack (man purse or if you buy things. I keep my water bottle and battery in there. Extra clothes, selfie stick etc and if you’re over your luggage limit you can take stuff out and put it in there. When not in use it fold up into a small bag.
   
   http://www.eddiebauer.com/product/stowaway-packable-20l-daypack/82300168?showProducts=111&color=147&sizetype=&size=
   
   
   
   

Looks like others have the bags covered well, so I will add some alternative ideas. Have you considered downsizing what you carry? Life at 20L is a lot simpler than at 30L. I am a sweaty (but not normally smelly)person and I have been able to switch to baby wipes and deodorant from a full shower and I am happier. I save a lot of time and storage space. I switched to the prana stretch Zion pants which can be bikes in with shorts underneath but are still fine in a business casual setting. I bike in with just a spare shirt wipes and deodorant in my bag. I take 5 minutes for my base layer to dry off a bit then go to the big stall and take off the bike specific clothes, wipe down and add deodorant then put on my collared shirt. I carry that, a small laptop and my lunch in a 20L backpack that I transport in one ortlieb pannier. Ortliebs will hold more than their stated volume but you sacrifice waterproof levels.

My opinion is that the best option is learning to live with 1 pannier. I added internal backpack as I have a long walk to my desk. The ortlieb is not nice to carry long distances and my parking is very secure.

If you really need a shower Micro fiber towels (faux suede)can also save a lot of space and still get you dry but require a different technique as they grab the skin a lot more. You need to dab or have it balled to wipe down. https://www.amazon.com/gp/aw/d/B01K1TX77W/ref=mp_s_a_1_1?ie=UTF8&qid=1520022164&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=microfiber%2Btowel&psc=1&th=1

This one works well... has anti microbial.

Don't store it wet. Twist it out after use and let it air out before you store it. I use mine daily at the gym (Large) and it's been going strong for months.

https://www.amazon.com/dp/B01K1TX77W/ref=cm_sw_r_cp_apa_i_2tQRCbNPVCK5H

Live in CO but when I commuted to work on my bike in NC in the summer I would take my clothes in my bag wipe the swear off with a microfiber dry towell (https://www.amazon.com/gp/aw/d/B01K1TX77W/ref=mp_s_a_1_3?ie=UTF8&qid=1486998051&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=fast+drying+towels+bath&dpPl=1&dpID=416HcYQQ56L&ref=plSrch) and the use baby wipes then dry off again then I used deodorant again. Helps to shower before your ride something about bacteria and microbes and starting fresh front he start keeps the smell away.

Not sure if it's $20 each or $20 for both.

Camping towel

Pocket knife wallet size survival kit

3D Cat puzzle

3D Cat puzzle box (a little over your budget)

Cat stress relief book