When I hunted Colorado in '06 with Kenneth my main bow was Elkie, a sinew backed osage bow. My back up was a tri-lam(boo/hickory/ipe). Kenneth had 2 selfbows. We carried a 4" schedule 40 PVE pipe with a screw cap on one end(my bow shipping tube). We dumped a 1# bag of rice down inside to help with moisture control. Each evening after the hunt we would wipe down our bows and put them in the tube(we were tent camping). It rained a few afternoons while we were out there but also we were camped near the creek with steep sides or either side so the humidity was always high. Neither of us noticed any loss of performance while we were there. The hygroscopic rate of most woods is quite slow. You put a moisture barrier around cthat and it takes quite a while for that moisture to effect the bows performance. On the other hand it takes just as long for that same moisture to leave the wood so bare that in mind after you hunt in bad weather or you go through a period of high humidity.