I regularly use 3/8" tubing for blow off on my 5gal batches, ending in a large half-full (or is it half-empty?) jar of water. The tube can gunk up and become difficult to clean, but I've never had a problem with it becoming totally blocked. You might also look into using Fermcap.
Atomic Dog Brewery
On Deck: Centennial IPA, Dry Irish Stout
P: Cascade Pale Ale
T: Carbed Crystal Light, Root Beer, Vanilla Cream Soda, Tripel IPA, Apfelwein
e^(pi*i) + 1 = 0